Category: Regional Rail

Regional Rail for New York: What Can Be Done Now

MTA Chairman Joe Lhota recently proposed to through-route commuter rail lines in the New York area, as was proposed in the past by the RPA, the Institute for Rational Urban Mobility, and more recently myself. Lhota proposed other, less flashy ideas for integration, including better track sharing at Penn Station and lengthening platforms to accommodate 10-car trains. Although a network that looks like my proposal should still be the goal for the next 20 years, there are several things that can be done in the very short run. None is do-it-tomorrow immediate, but neither does any require very difficult modification of equipment or organization or significant infrastructure investment. Most should not require extensive studies.

Note that this is not a wishlist of the most important commuter rail reorganization projects in the region. Many of those reorganizations do not have anything to do with interagency integration, and are therefore not included. Only projects that are very cheap and would come from or benefit integration are on this list.

1. Integrated ticket machines at Penn Station. This requires the physical tickets on New Jersey Transit to look like those on the LIRR and Metro-North (and thus some modifications to the fare barriers at Secaucus and Newark Airport), and some reprogramming of ticket machines, but no change otherwise. Ideally a ticket from (say) Hicksville to Newark should cost less than the sum of tickets from Hicksville to New York and New York to Newark, to encourage reverse-peak traffic, but strictly speaking the discount is not needed. Amtrak and commuter rail machines should also be integrated, though the physical tickets can still be different if switching over is too hard.

2. Integrated concourses at Penn Station. This means treating the upper and lower concourses as belonging to all three railroads. This requires Amtrak to give up its single-file queuing and accept that people already can walk around and get to its trains from other railroads’ turfs. Trains should be announced on all concourses, and all access points to a platform should be clearly signed with the next train’s type and schedule.

3. Timed transfers. Although a clean integrated timetable is impossible, because trains interline on some inner segments to increase capacity, a partial version is still possible. What this means is that, with hourly off-peak service on each branch, Morris and Essex trains should arrive at Penn Station just before the hour, as should one of the several hourly trains on the New Jersey side of the Northeast Corridor, and then two or three branches going to the east (say, to New Haven and Port Washington, and on one additional LIRR line for service to Jamaica) should leave just after the hour, with the tightest connection done cross-platform. This would make trips from New Jersey to JFK and from Long Island to Newark easier, and the choice of services to participate in the system should be consistent with even spacing on interlined trunks.

4. Modification of rolling stock. Metro-North’s M8s can run under 60 Hz catenary and third rail, but unfortunately not 25 Hz catenary; as lower frequency requires a larger transformer, modifying the trains to run on the New Jersey side of the Northeast Corridor may be too hard in the very short term (though not in the medium and long terms). However, NJT’s ALP-46 locomotives and Arrow EMUs can run on 12 kV 25 Hz and 25 kV 60 Hz catenary, and thus modifying them to run on Metro-North’s 12 kV 60 Hz catenary is easy, allowing them to run from the NJT network to the New Haven Line. Unfortunately, because locomotives accelerate more slowly than EMUs and the Arrows are quite old, they do not have very good performance for short-stop service, for which through-running is the most useful.

5. Voltage change on the Northeast Corridor’s New Jersey side to 25 kV 60 Hz. This voltage change was done to the Morris and Essex lines and much of the North Jersey Coast Line. It is somewhere on Amtrak’s wishlist of projects, but I do not know how high it is. This allows M8s to run through, ensuring the better rolling stock is available for the service that needs it the most. It may possibly be bundled with Amtrak’s installation of constant tension catenary south of New Brunswick to reduce costs. Since this eliminates the need for 25 Hz transformers in the future, this meas future NJT rolling stock would be lighter.

6. Depending on 4-5, rolling stock sharing along interlined services. In practice this means M8s on local Northeast Corridor services, which would also allow adding and serving infill stations in New Jersey (for example, more regular service to North Elizabeth, and perhaps a station at South Street in Newark), and Arrows and locomotives on express services from Penn Station and New Jersey to New Haven.

7. Platform raising on the North Jersey Coast Line and the Morris and Essex lines, if service using M8s rather than Arrows is desired. Because of the voltage, it’s actually easier for M8s to serve the Morristown Line other than their inability to serve low platforms: it would only require 8-21 km of reelectrification rather than 88-101. The Morris and Essex lines also have a more inner-suburban distribution of ridership than the Northeast Corridor Line, which gets most of its ridership from more distant stations, and this makes them in one sense better-suited for through-service. (In another sense, the Northeast Corridor is better, since it serves downtown Newark, a secondary CBD that draws some commuters from suburbs and boroughs east of Manhattan.)

It is my belief that all of the above, possibly except #5 and #7, are feasible within months or at worst a very small number of years, and would not require additional environmental work. Even #5 and #7, which are more expensive, are still close to two orders of magnitude cheaper than a full through-running plan with new tunnels serving Lower Manhattan.

The medium term is more expensive – perhaps an order of magnitude less than the full program rather than two – and would include further modernization, allowing full through-service on every line and more efficient equipment utilization. It can also assume friendlier regulations, which a snap integration cannot, and this in particular means better rolling stock in the future and higher speeds even with existing rolling stock. Clockface schedules and frequent off-peak service would allow planning infrastructure repairs and upgrades around specific schedules. For example, the current local Stamford-Grand Central schedule is 1:06, but an express train I recently took from New Haven came to Grand Central more than 10 minutes ahead of schedule, suggesting excessive padding; minor upgrades should allow an M8 to do Stamford-New York in an hour minus turnaround time making local stops, and more ambitiously New York-New Brunswick in 45 minutes minus turnaround time.

Lhota can’t do much in the long term, because this requires an enormous investment into concrete, a political decision and a longer-term one than Lhota’s term as MTA chair. However, he can both implement the above seven points within his term, and also set in motion various work rule reforms and small-scale capital project planning and apply for the requisite FRA waivers to permit the medium-term reforms to succeed.

Followup on the Providence Regional Rail Shuttle

Peter Brassard’s proposal for a very frequent-stop mainline train in Rhode Island received comments both here and on Greater City, dealing with issues from rolling stock to station choice to scheduling. Some are fairly trivial, some aren’t. The upshot is that the project is technically feasible, but requires political head-bashing, especially with regards to scheduling.

First, the easy part: if the line is only to run between Central Falls and Warwick, then the rolling stock should be electric; this both improves performance and eliminates a political bottleneck, because the EMU market is larger than the DMU market, and in case FRA regulations do not change and obtaining a waiver is too expensive, there are M8s ready to use. The M8s are heavier than is ideal, but their performance is to my knowledge imperceptibly worse than that of noncompliant trains in the speed range appropriate for the short stop spacing, up to about 100 km/h.

Scheduling is the problem, because there has to be track sharing with something. The line is three-tracked: there are two tracks for Amtrak, also used by the MBTA north of Providence Station, and one track for freight. The line used to be four-tracked, but was reduced to three tracks in the 1990s in order to widen the track centers and allow the Acelas to tilt. Further reduction in track centers is not acceptable: at 4 meters (more precisely 13′) the distance is shorter than the standards for greenfield construction in Europe and even Japan. Track center standards are laxer on lower-speed segments, as the trackage through Providence is, but tilting becomes unsafe for an Acela-wide train. (The Pendolino is 37 cm narrower than the Acela.)

The alternative is to slightly widen the right-of-way at certain overpasses to allow four tracks, for a minimum of 20 meters with 4-meter track centers; some work, including widening, is already required to make room for platforms, and many of the most constrained locations, such as Olneyville at 18 meters, are station stop sites. It’s this construction that would most likely be the bulk of the project cost. At much lower cost, it would also allow electrification of the full corridor, making EMUs a feasible rolling stock choice for the local trains.

With four tracks, the question becomes, what regional rail should share tracks with. The choice is between intercity trains, which are currently slow but could be sped up, and freight trains. Both require political maneuvering, because neither Amtrak nor the Providence and Worcester has operating practices that are compatible with punctual passenger service. (Amtrak is more easily reformable, but an Amtrak that’s been so reformed is an Amtrak that runs trains much faster on the Northeast Corridor, increasing the regional/intercity speed difference).

I contend that it’s actually more correct to share tracks with freight. The sharpest curves are at stations, and so no superelevation is needed, but even if it were, allowing 100 km/h passenger trains could be accommodated with minimal freight train cant excess (about 25 mm at 50 km/h). More importantly, freight and local passenger rail have similar average speeds. The speed profile is different – freight is steady and slow, local passenger rail attains higher speeds but makes frequent stops – but when headways are long enough, this is not a problem.

On page 46 of the Providence Foundation study on a similar passenger line, we see that there aren’t many freight trains, so headways are determined by passenger trains. The freight schedule on page 48 of the same study suggests that freight and passenger train speeds would be very similar. It has trains doing Pawtucket-Warwick in 23 minutes; modern EMUs with a top speed of 100 km/h (losing 45 seconds to each station stop) and making the proposed stops would do the same in 25 minutes, with 7% padding. The local passenger train is a hair faster than the freight train on the Providence-Pawtucket and Cranston-Warwick segments, in both cases by less than a minute, and a bit slower on the Providence-Cranston segment, where station spacing is denser. This is close enough that I believe that 15-minute passenger train frequency is no barrier to track sharing. Potentially even 10-minute frequency can be accommodated. It requires freight trains to be somewhat timetabled, but they’d have a window of several minutes to enter between each pair of successive passenger trains, and missing their window would not delay them by more than 15 minutes. There is, then, no technical barrier to sharing tracks with freight.

The alternative, sharing tracks with intercity trains, is more dubious. Although less construction is required, the speed difference is larger. Instead of taking 23 minutes between Pawtucket and the airport, optimized intercity trains would take 8:45, including padding and a station stop at Providence. They can pass local trains at Providence, at the cost of slowing them down by several minutes while they wait to be overtaken, but even between Providence and the airport, travel time would be 5 minutes for intercity trains and 17 for regional trains.

If there’s four-tracking in Warwick, or two stops are dropped, then it’s tight but doable. Otherwise, it’s not; 12 minutes is too long a window for 15-minute service. It would require an extra terminating track at Warwick, but that would be needed anyway. The problem then is that local Rhode Island trains and MBTA trains would interfere with each other at Providence because both would dwell at the station for too long.

Interlining the two services and having MBTA trains make local stops in Providence is possible, and in conjunction with the two-overtake schedule for Boston-Providence naturally yields a three-overtake schedule. The problem is that the more overtakes there are the more reliability suffers. If an hourly freight train misses a window and needs to be delayed 15 minutes, it’s no big deal; if the goods couldn’t take a 15-minute delay, the train would be sufficiently punctual to make the window. If a passenger train misses a window, it requires the train behind it to slow down and this is not recoverable if the schedule is so tight.

When it’s unavoidable it’s best to just invest in running trains on schedule, but in this case a three-overtake schedule is avoidable. Thus track-sharing with freight is the correct option, leaving intercity trains to have a track that’s entirely theirs south of Providence, as this shuttle concept would almost certainly take over Wickford Junction service if necessary. It conveniently also allows higher regional rail frequency should the need ever arise, and because the scheduling is loose makes it easier to shoehorn another line into this system.

Commuter Rail, Urban Infill Stations, and Shuttle Train Rapid Transit

This is a proposal by Peter Brassard, who comments here and on Greater City: Providence. It was published on Greater City first, and is mirrored here as the site is experiencing server problems.

Rhode Island’s commuter rail service as currently conceived may not be conducive to encouraging ridership. Distances between existing and proposed stations are too far. Much of the focus has been on extending the system further into low-density suburbs. For Rhode Island commuter rail to succeed, more needs to be done to take advantage of existing walkable urban neighborhoods that have a high potential for passengers. Some of these areas have large amounts of commercial/industrial space or development opportunities. Due to Downtown Providence expansion, the rail system will be challenged, as long as there’s no internal downtown high-frequency transit, such as the proposed Core Connector, to directly link rail passengers to the far reaches of downtown.

Rhode Island’s commuter rail doesn’t capitalize on density variations and neighborhood assets of the Providence area. If Rhode Island’s commuter rail functioned as a rapid mass-transit system, besides increasing the number of passengers, it would help to revitalize and expand development opportunities for neighborhoods along the rail line. The implementation of medium frequency shuttle train service within the Rhode Island instate rail corridor would offer predictable headway times at regular intervals that could operate in addition to MBTA commuter and Amtrak trains. Air and intercity train travelers, commuters, and the general public would greatly benefit from this level of service.

A variation to a commuter rail or shuttle train is the German S-bahn or French RER or San Francisco’s BART. An S-bahn type system is usually the same as commuter rail in suburban areas, but differs when it’s within the central urban core, where it has characteristics of a subway or metro. Usually stations within the core zone are located close together at quarter- to half-mile subway station distances and schedule headway times typically fall somewhere in the middle of commuter rail and subway schedules. Depending on the city, central core rail infrastructure can be underground or at grade utilizing existing rail corridors. A hybrid of a shuttle train and an S-bahn might best for Rhode Island.

One way to organize Rhode Island’s rail system would be to create different station tiers allowing for various levels of service and investment in station infrastructure. Tier service levels could be thought about as intercity or express (Amtrak), regional or limited (MBTA), and local (RI Shuttle trains). Shuttle trains should be able stop at all stations and MBTA trains should have stops at major commuter and Amtrak stations. The hours of operation of a shuttle train should extend to weekends and late evening at all stations. Because a shuttle train schedule would be frequent and regular, it would relieve the need to increase the number of MBTA commuter trains for Rhode Island transit needs or having to extend MBTA weekend service south of Providence.

Shuttle train stations should require a lower level of investment. Platforms could be adjacent to the freight track. Priority should be given to constructing affordable shuttle train infill stations without automotive accommodations. An infill train station could consist of as little as a single high-level concrete platform with stairs, handicapped ramp, railings, partial canopy, lighting, and signage. Some stations might require an elevator instead of a ramp for ADA access. Without the land acquisition and construction costs for parking, drop-off facilities, station buildings, or pedestrian bridges, the cost range for a barebones single 300-foot long infill platform with modest accessories should cost between $500,000 to $1-million. A typical 900-foot long platform would be roughly $2 to $4-million. Because of increased service frequency, a shuttle train could have fewer cars and utilize shorter platforms that could be extended in the future, reducing the initial infrastructure investment. Shorter trains and platforms would allow the system to develop incrementally as ridership increases.

Infill stations should mostly be located within high-density urban neighborhoods where people can either walk or take existing bus transit to stations with limited or no automotive infrastructure. To optimize use by pedestrian’s stations should be designed so that they would have direct access from sidewalks of major streets with bus routes. Major streets and bus routes can act as siphons to funnel potential passengers from adjacent neighborhoods to stations. Bus routes that intersect the rail line corridor would effectively extend the passenger capture area of a walkable neighborhood. A passenger capture area would be the total population that’s within less than a 12-minute walk and/or a 7-minute bus ride to a train station.

Infill stations could become catalysts to renew employment opportunities in older industrial neighborhoods, reinforcing economic development. Less advantaged people from urban neighborhoods would be able to commute without needing a car. A series of stations served by frequent shuttle train service would create true rapid transit for Rhode Island passengers to quickly reach jobs or homes in adjacent cities or distant neighborhoods, not possible with the bus system. The increased use of commuter/shuttle trains would reduce traffic congestion and lower air pollution. Opportunities to concentrate additional employment and population around stations would help to limit the expansion of suburban sprawl.

There is historic precedence of having closely situated train stations within Providence documented on city maps from 1918.  (Link 1) (Link 2) In addition to Union Station, previous train stations existed at Atwells Avenue, in Olneyville at Westminster Street (northbound) and Dyke Street (southbound), Cranston Street, and in Elmwood. There are likely other forgotten stations outside of Providence. I remember being told as a boy that my great-grandfather would regularly take the train to Providence from Woodlawn in Pawtucket. As late as the 1960s there were the ruins of a wooden stairway leading down to the tracks at Lonsdale and Mineral Spring Avenues.

Currently proposed urban infill stations are 300 Barton Street in Pawtucket, Olneyville, and Park Avenue in Cranston. Other potential infill stations could include Central Falls and in Providence at Reservoir Avenue, Cranston Street, Atwells Avenue, and Charles Street. Also Hunt Street, Mineral Spring Avenue, Branch Avenue, Dean Street, Union and Roger Williams Avenues could be considered. Suburban industrial infill stations could be built toward the northern end of Jefferson Boulevard and Davisville/Quonset though these locations might require additional bus shuttle service. There would be infill station opportunities with the Lincoln and Cumberland villages along the Blackstone River, for when train service would be extended to Woonsocket. A station at Route 116 with elevators and escalators reaching to the Washington Highway bridge deck would allow passengers to access buses to Lincoln and Smithfield’s office region.

For details, see this map, overlaid on a RIPTA bus map. It shows potential shuttle train stops within walkable urban neighborhoods. Distances between stops are generally at half-mile intervals.

Olneyville’s potential for a high number of passengers should be a top priority. The current proposal for Olneyville locates a platform on Harris Avenue, away from the Broadway and Westminster Street bus routes. This location was likely chosen because construction costs would be low. A direct access walkway/ramp to the Harris Avenue platform from Broadway and Westminster should be provided, which could be developed through easements with the abutting commercial property and elderly high-rise south of the proposed platform. From looking at census tract data and existing bus routes the passenger capture area for Olneyville is probably the highest with roughly 28,000 people who could reach the station in less than a 12-minute walk and/or 7-minute bus ride. If only 5% of that population used the train that would equal 1,400 people or up to 2,800 passenger trips per day. Olneyville also has over a million square feet of commercial/industrial space, much of which is vacant or underutilized, plus vacant land for new development within walking distance from the station location.

RIDOT has two alternatives, option “A” and option “B,” for a Pawtucket/Central Falls infill station. Pawtucket officials and RIDOT favor the 300 Barton Street location for a Downtown Pawtucket station. Fewer people would be within walking distance of this station, but bus service would expand its passenger capture area of roughly 13,000 to15,000 people. The lower western quadrant of Central Falls would be walkable to this station. Development opportunities would be great for Downtown Pawtucket. RIDOT/VHB’s proposed 2009 Option “A” plan would be preferable, as both proposed station platforms would have direct access to Dexter Street’s sidewalks and buses without requiring a special drop-off circle for buses within the parking lot.  Option “B” should be rejected as it isolates the station creating a condition favorable to automobiles and access to Dexter Street would be indirect and circuitous for pedestrians, which might limit opportunities for smart growth development in Downtown Pawtucket. The current plans to include a parking lot and vehicle drop-off area, though expensive should probably remain, since Pawtucket is a regional center and would be a major MBTA station. In the future the current proposed parking lot could be upgraded to a multi-level structured facility.

In Central Falls a rail platform located near Sacred Heart Avenue would serve the eastern half of Central Falls and some of Pawtucket north of downtown. Roughly 8,000 people would be within walking distance of this station, which would not have pedestrian overlap with the proposed Barton Street Station in Pawtucket. The adjacent Central Falls neighborhoods that would benefit are among the poorest and highest density communities in the state. This station location should be considered in addition to Barton Street.

Other infill station possibilities include a Cranston Street station, which would have a passenger capture of roughly 13,000 to 15,000 people in Providence and Cranston. The Huntington Industrial Park on Niantic Avenue has about a million square feet of commercial/industrial space, some of which has been converted to offices. Not that it’s necessarily practical to rebuild the entire district, but the Huntington Industrial Park is built-out to a small fraction of what is permitted by current zoning. The Corliss Industrial Park at Charles Street has similarities to the Huntington Industrial Park. A Charles Street station would have an approximate capture area of about 15,000 to 17,000 people. Passengers would be more reliant on arriving by bus from the North End-Charles Street area, Wanskuck, and Elmhurst, since the potential for passengers walking to the station might be more limited.

Reservoir Avenue near Adelaide would have a capture area of about 14,000 to 16,000 people in Elmwood and the Reservoir Triangle extended by bus to parts of Cranston, South Providence, and the West End. An Atwells Avenue station might only have a capture area of 5,000 to 6,000 residents, but a station platform at this location would be a critical link to Atwells Avenue restaurant/retail tourism district, as well as, commercial and industrial space in the Eagle Square vicinity and residential neighborhoods in the Valley area, parts of Federal Hill, Lower Mount Pleasant and Olneyville. A Cranston station located at or near Park Avenue would have a rough capture area of 6,000 people from Cranston, South Elmwood, and Warwick. If a Park Avenue bus route were reinstated for the full length of the avenue, the station’s passenger capture area could be further expanded. This location would likely be a major MBTA commuter station and require automotive access and parking facilities.

To justify the construction costs for the TF Green and Wickford commuter rail stations and parking facilities, there should be as many commuters destined for Providence as for Boston. It is possible for commuters to access distant employment areas within the Boston/Cambridge area because Boston’s subway extends the reach of commuter rail stations. The expanded Downtown Providence area will be handicapped as several of the city’s employment areas are beyond reasonable walking distance and underserved by bus transit. It’s essential to build at least a portion of the Core Connector to make Providence Station viable as a destination commuter rail station.

Maximum interconnectivity to multiple stations with a large potential passenger base is the key to creating a robust rail system. The current blueprint for Rhode Island commuter rail is limited. To revive older neighborhoods and improve the state’s economic base, the rail system should serve more than just Providence and Boston commuters and intercity train travelers. Providing a handful of expensive commuter rail stations, most of which in low-density suburbs, is not enough to substantially increase commuter train ridership and insure the success of the system. It would have to be confirmed, but it’s likely that between Central Falls and Cranston there are 100,000 people that could reach the rail line by a short walk or bus ride.

It may be unconventional to propose constructing inexpensive infill train stations geared toward pedestrians and bus riders without parking, who would be served by shuttle trains, but it would transform Rhode Island’s rail system into rapid mass-transit, as well as, commuter and intercity rail. Besides being economical, urban infill stations could be built quickly. Since platforms are relatively low cost and there’s a present need to improve the regularity of train service between Providence and the airport, rather than spending years on studies, conducting a pilot program where a few or several urban infill stations could be built would be worth testing. All passenger types would benefit with this truly competitive alternative to driving within the core metro area. The passenger base for RIPTA buses would be reinforced and expanded, as would MBTA commuter trains. There may be objections from Amtrak and the MBTA or others regarding close proximity of stations and frequency of service. Since Amtrak schedules are on one- or two-hour intervals and MBTA trains run approximately on the half hour at weekday peak and less frequently at other times, urban infill stations and shuttle train service operating mostly on the freight track shouldn’t interfere with either agency. The advantages of developing a rapid-transit rail spine for Rhode Island’s people and economy would outweigh any objections.

The Cost of Heavy Freight Trains

Over at Pennsylvania HSR, Samuel Walker reminds us that the dominance of coal for US freight traffic slows down passenger trains, and this has a social cost in addition to the direct costs of coal mining and burning. But another post of his, regarding cant deficiency, suggests more problems coming from mixing modern passenger trains with very heavy freight. Coal trains slow all other traffic in three different ways, of which just one is the conventional schedule conflict, and even that means more than just slowing down intercity trains.

Schedule conflict reduces not just speed, but also span and punctuality. The Northstar Line in Minnesota shares track with BNSF’s Northern Transcon; since the line is freight-primary, there’s no room for off-peak service, and passenger trains can’t extend to the line’s natural terminus in St. Cloud, not without constructing additional tracks. Similarly, in Houston, plans for a commuter line to Galveston included peak-only service from the start.

Second, independently of scheduling, slow trains force faster trains to slow down by limiting the amount of superelevation that can be used. As a reminder: on curves, they bank the track, with the outer rail above the inner rail, to partly counter centrifugal force. If they do not cant the train enough, there’s cant deficiency; if they cant too much, there’s cant excess. Although there are strict limits for cant excess (in Sweden, 100 mm, or 70 on tighter curves), stricter than for cant deficiency (150 mm for a non-tilting passenger train, give or take), technically commuter trains could safely run at higher cant excess; however, for freight trains, high cant excess is unsafe because loads could shift, and the higher axle load means trains would chew up the inner track. Very heavy trains first require the track to have a lower minimum speed, and second have an even more limited cant excess because of the damage they’d cause to the track (about 2″, or 50 mm, in US practice). Walker links to a US standard guideline that uniformly assumes 3″ cant; greenfield high-speed lines go up to 180-200 mm.

And third, heavy freight trains damage tracks regardless. Coal trains also limit the amount of revenue the railroad gets out of each train, leaving limited money for maintenance, and are not time-sensitive, giving railroads no reason to perform adequate maintenance. To compensate, industry practices have to be less than perfect: cant and cant deficiency are less than the maximum permitted by right-of-way geometry and minimum speed, and freight railroads require barriers between their track and passenger track to protect from inevitable freight derailments. Even then the US safety level is well below what’s achieved anywhere else in the world with trustworthy statistics.

Of course, coal provides a great boon to the freight railroads. It’s a captive market. The railroads could price out coal and focus on higher-value intermodal traffic. Some of the lines that already focus on intermodal traffic are friendlier to passenger service, such as the FEC.

However, realistically, the end of coal is only going to come from environmental regulations. Those same regulations would apply to oil, inducing a mode shift from trucks to rail. The coal trains that would stop running would be replaced by trains carrying higher-value goods. The details depend on what the purpose and kind of environmental regulations are, but today’s environmental movement is heavily focused on climate change and not as concerned with local environmental justice, so loss of coal traffic due to a high carbon tax or local air pollution tax, both of which would also affect oil and gas, is much likelier than loss of coal traffic due to restrictions on mountaintop removal and air quality regulations at mining sites, which would not. (Of course oil causes plenty of damage to the biosphere, but the mainstream environmental movement is much more concerned with effects on humans than on other organisms.)

The political issue at hand, besides the easy to explain but hard to implement matter of avoiding catastrophic climate change, is what freight railroads are used to. Their entire business model is geared toward relatively low-value goods. A steep carbon tax is a risk: it should raise their mode share of total value of goods transported, which is currently 4% (see also figure 4.3 here), but it would come from a new set of goods, with requirements and challenges different from those of the current mix. The railroads would have to reintroduce fast freight, which most haven’t run in decades, and refine it to deal with the needs of shippers today. It’s not only a headache for the managers, but also a substantial risk of failure – perhaps rival railroads would be able to get all the traffic because they’d adapt to the new market faster, perhaps shippers would change their factory placement to move goods over shorter distances, perhaps they would not be able to cope with the immediate increase in fuel costs, etc.

Because of this, freight railroads may end up fighting a policy that would most likely benefit them. Although they represent a critical part of an emission reduction strategy, and are all too happy to point out that they consume much less fuel than trucks, fuel is a major cost to them, and coal is big business for them. These are not tech startups; these are conservative businesses that go back to the 19th century. Heavy coal trains then add a political cost as well: they help turn an industry that could be a major supporter of climate change legislation neutral or hostile to the idea.

What’s a Subway/El?

The rapid transit built in New York beginning with the first els codified two characteristics that spread to the rest of the US, and are often seen in other countries’ rapid transit networks as well. First, it is separate from surface transit – even when it did still have grade crossings, they were controlled railroad crossings, rather than street-running segments as is common on light rail. And second, it is separate from mainline rail.

Not much later than New York started building els, Berlin built the Stadtbahn, also an urban elevated railroad. However, it was meant to be used for mainline rail from the start, with two local passenger tracks and two long-distance passenger and freight tracks. Part of the impetus was to connect different railroad terminals within the city, which American cities did by building union stations disconnected from local traffic. Shortly later, Tokyo built its own mainline rapid transit system – the Yamanote Line bypass in 1885 and Tokyo Station connecting the Chuo and Tokaido lines in 1914. Both cities ran frequent local commuter service early, Berlin doing so even before electrification.

Of course, nowadays US regulations locked in the separation of rapid transit from commuter rail, but at the time, there was no such separation. New York could have built its subway to mainline specifications and run trains through to the LIRR. It didn’t because of historical accidents – it preferred compatibility with the els and even when the BRT chose a wider loading gauge for its own subway network, it still opted for narrower trains than on mainline track. At the time it seemed like no big deal, although some of the subway lines built were redundant with existing commuter lines (for example, the Flushing Line with the Port Washington Line). Again due to historical practice, commuter rail did not try to operate to rapid transit standards, keeping frequency low, and so nearly all urban stations closed. In both New York and Chicago, it’s often easy to figure out where the city ends or where the subway/L network ends because that’s the point beyond which commuter train stop spacing narrows, providing makeshift local service.

In subsequent decades, the German and Japanese approach proved itself much more capable of providing good transit to growing suburbs. In Tokyo, subways are legally railroads, and most lines are compatible with at least one commuter line in order to permit through-service. German cities have mainline rapid transit (S-Bahn) and also separate subways or subway-light rail combinations (both called U-Bahn). Many other cities and countries had to adopt the same system to increase transit ridership, at much higher cost since the necessary viaducts and tunnels connecting stub-end terminals were done much later. This is what led to the Paris RER, and what’s led to Thameslink and now Crossrail in London. Any other approach would require spending even more money on extending urban lines to the suburbs, exactly what’s done now in the two big suburban-focused US rapid transit systems, the Washington Metro and BART.

The kink is that despite the above problems of subways that are separate from both mainline and street rail, there’s now a different reason to build such lines after all: they can be made driverless. Most first-world cities already have legacy rapid transit or else have so much sprawl rapid transit is inappropriate, and third-world cities aren’t saving much money by eliminating drivers, but in the few cases of new builds (Vancouver, Dubai, Copenhagen, the newer lines in Singapore), driverless trains are common, and this allows trains to run more frequently, or even 24/7 in Copenhagen’s case.

This kink aside, there’s really no reason for a city to build a new New York-style subway, i.e. disconnected from light and commuter rail and running with a driver. Extending a legacy system is fine, but for new systems, there’s no point. This could be especially bad in growing third-world cities, which could find themselves paying too much for a subway they don’t need or unable to connect a subway they do need to the suburbs once they start suburbanizing. Third-world construction costs aren’t much if at all lower than first-world costs, but wages are much lower.

Some of the world’s largest cities have made or are making this mistake. Mumbai is building a new subway, on a different track gauge from the Indian mainline network, preventing through-service to the overburdened commuter trains. Shanghai and Beijing have vast subway networks, without express tracks or any ability for trains to run fast through city center; they have widely spaced stops so that they are faster than most other subway systems, but they have nothing on the rapid commuter trains in Tokyo. (Beijing is also developing a parallel commuter rail network, running diesel trains from the exurbs to the traditional city terminals at low frequency.) It works fine now, but when Shanghai grows and suburbanizes to the degree Tokyo has, it may find itself having to spend many billions on digging new tunnels.

Since a New York-style subway is inappropriate for new builds, some cities need to ask themselves which of the three kinds is the most appropriate. A subway-surface solution is mainly an option when one underground line can naturally split into multiple surface lines, as is the case in BostonSan Francisco, Cologne, and Frankfurt; this is because there’s a big difference between on-street and grade-separated capacity.

Tel Aviv, which is building a subway-surface line without any branching, is doing it wrong. For the other choice, I believe it’s a matter of how well-developed the suburban rail network is, and how much future suburbanization the city can realistically expect. In Tel Aviv specifically there’s also a separate element, which is that for religious reasons public transit does not run on weekend. If driverless technology makes the difference between trains that run 24/7 and trains that run 16/6, then it should be used even at the cost of otherwise worse service to some suburbs and destinations easily reached by legacy rail branches.

Finally, in North America, one of the reasons to engage in strong regulatory reform is to allow the mainline option to work. Some lines, for example the Harbor Subdivision between LAX and Union Station, should ideally host a mixture of local and rapid trains on the same tracks, and also allow intercity trains; if the Harbor Sub becomes an electrified commuter line then high-speed trains could serve the airport, providing a connection from the Central Valley to a major airport in addition to SFO, which would only get a station at Millbrae.

More in general, the only real disadvantage of legacy commuter networks is that they tend to not be very dense in the center of the city, requiring new builds; most of the Tokyo subway is just lines offering the commuter lines more capacity into the CBD, overlaying itself to also provide a tight in-city network. There’s no technical reason not to just build an electrified local mainline network as its transportation backbone, and if more capacity is required then build additional lines in the mold of Tokyo.

Transportation-Development Symbiosis

The RPA’s Regional Assembly has included the following idea submission: expand reverse-commuter rail service. The proposal calls for surveying city residents to look for the main available reverse-commuter markets, and for expanding reverse-peak service on the model of Metro-North. It unfortunately does not talk about doing anything at the work end – it talks about looking at where city residents could go to the suburbs on commuter rail, but not about which suburban job markets could be served from any direction.

I don’t want to repeat myself about what transit agencies have to do to be able to serve suburban jobs adequately (if “suburban” is the correct way to think of Providence and New Haven), and so I’m going to sound much harsher toward the idea than I should be. Suffice is to say that talking about development requires a lot of reforms to operating practices. With that in mind, let’s look at some suburban job centers in the Northeast: Providence, Stamford, Hicksville, New Haven. As can be seen, those stations all look very suburban, and even Providence is surrounded by sterile condos, with the mall located a short, unpleasant walk away. Compare this with the urbanity that one finds around major suburban train stations in Tokyo, such as Kokubunji and Tachikawa.

But really, the kind of development that’s missing around suburban train stations in the US is twofold. First, the local development near the stations is not transit-oriented, in the sense that big job and retail centers may be inconvenient to walk to for the pedestrian. And second, the regional development does not follow the train lines, but rather arterial roads, or, in cities with rapid transit, rapid transit lines – for example, one of Long Island’s two biggest edge cities, East Garden City, is diffuse and far from existing LIRR stations (the other, Mineola, is relatively okay).

In both cases, what’s missing is transportation-development symbiosis. Whoever runs the trains has the most to gain from locating major office and retail development, without excessive parking, near the train stations. And whoever owns the buildings has the most to gain from running trains to them, to prop up property values. This leads to the private railroad conglomerates in Tokyo, and to the Hong Kong MTR.

The same symbiosis can be done with government actors, but isn’t, not in the US, and the RPA’s attempts to change this and promote integrated planning have so far not succeeded. Hickville recently spent $36.4 million on a parking garage adjacent to the station plus some extra sum on expanding road access, but none of the relevant actors has made any effort to upzone the station area for commercial, to allow easier commuting. Providence is renovating the station, with pretty drawings, but doing far short of a redesign that would add development to the area.

The importance of this symbiosis, coming back to the original idea, is that the correct question to ask is not, “Where can city residents go to the suburbs to work?” but rather “Which suburban and secondary-urban destinations can be adequately served by rail?” In all four Northeastern cities under discussion, there is more than one direction from which commuters could come. From the commuter railroad’s perspective, a rider who takes the train in the traditional peak direction but gets off in a suburb short of the CBD is a free fare, just like an off-peak rider or a reverse-peak rider.

The task for regional planners (as opposed to service planners and railroad managers) is then a combination of the following priorities:

1. As noted above, ensuring edge city and secondary CBD development is both close to train stations and easily accessible by pedestrians.

2. Aggressively upzoning near potential station sites, with an eye for junctions, such as Sunnyside, Secaucus, and New Rochelle.

3. Examining where people working in secondary centers are living, and which rail lines could be leveraged to serve them and where new construction would be needed. For example, Providence could use rail to Woonsocket and the East Bay and more local service to Cranston and Warwick, but reviving the tunnel to the East Bay could be expensive and needs to be studied carefully. Note that north of South Attleboro, there are very few people living near the Providence Line working in Providence, and so reverse-peak service is useful mainly in the original sense of people reverse-commuting from Boston, in contrast with service to Massachusetts suburbs of Providence such as Seekonk.

The problem with doing all three is political: current regional rail traffic is dominated by suburbanites using it as an extension of driving into the city. This influences local thinking because the economics of residential development are not the same as those of commercial development. Agglomeration and density are less important. Transfers and long access distances are more acceptable. People traveling within the suburb go toward the station in the AM peak rather than away from it, and so parking availability is more important. Take all of these together and you get a powerful constituency supporting continuing to choke suburban train stations with parking and sterile development for city-bound commuters, no matter how many tens of thousands of jobs are nearby.

This is why some symbiosis is necessary. One way to do it is via market mechanisms: if a well-capitalized company gets ownership of the transit infrastructure and is free to develop with few zoning constraints, it could decide to build office towers in Hicksville on top of the train station, or develop the empty lots near New Haven and Providence. This is possible, but may well be too hard politically, even more so than direct zoning reform, because every trope used by the community to oppose the changes (namely, fear of outsiders) would apply and also there would be explicit loss of control.

The other way is the public way, which is where integrated planning comes in. Even on the level of intransigent railroads, it may work if all done together. In other words, there would be simultaneous effort to add reverse-peak service on the LIRR and the MBTA, upzone surrounding station areas and make them more walkable at the expense of some parking spaces, direct major developments such as malls and office complexes to the resulting TOD, and integrate local transit with the changed commuter service in all directions.

But whatever is done, it’s critical to integrate the two functions, of transportation and development. There’s no need for an overarching bureaucracy to take care of it all, even – just cooperation between regional planners, local planners, and transit managers. Transit needs thick markets, and if all development outside the primary CBD is diffuse and auto-oriented, there will not be any thick markets for it to serve. A transit revival necessarily requires new markets, and this means going after what are now hopelessly auto-oriented suburbs. And what needs to be done is not just figuring out where new service is required or where car-free urbanites commute to, but also what kind of TOD can be done at each secondary job center.

Train Weights, Bilevel Version

My previous table of train weights covered single-level trains, with the exception of the ultralight (for a bilevel) TGV Duplex. By request, here is a similar version for bilevels. Note that very light trains such as the E231 or DB’s Class 423 are inherently single-level – though a bilevel Green Car trailer version of the E231 is quite light, even at 50% heavier than a single-level trailer.

Recall that Lng is length in meters, Wt is empty weight in (metric) tons, Width is in meters, Pow is maximum short-term power in megawatts, P/W is power-to-weight in kilowatts per ton, Ld is average load per axle in tons, and Wt/Lng is weight in tons per meter of train length.

Train Lng Wt Width Pow P/W Ld Wt/lng
E231 series Green Car 20 36 2.95 0 0 9 1.79
215 Series 200 368.5* 2.9 1.92 5.2 9.2 1.84
TGV Duplex 200 380 2.9 8.8 23.2 14.6 1.9
Bom. BiLevel Coach 26 50 3 0 0 12.5 1.91
KISS, Regional 150 297 2.8 6 20.2 12.4 1.97
KISS, Interregio 100 212 2.8 6 28.3 13.3 2.11
E4 Series 201 428 3.38 6.72 15.7 13.4 2.13
NS DD-AR (w/ mDDM) 100 221 2.8 2.4 10.86 13.8 2.21
GO Transit MPI hauling 12 Bom. BiLevel Coaches 332 734 3.24 3 4.1 14.1 2.21
Metra Highliner 26 59 3.2? ? ? 14.8 2.28
Caltrain Coradia 213 517 3.2? ? ? 16.2 2.43
X40 (Coradia, Sweden) 81.5 205 2.96 2.4 11.7 17.1 2.52
Caltrain MPI hauling 5 Bom. BiLevel Coaches 150.5 384 3.24 3 7.8 16 2.55
CityRail A-sets 78 201 3.04 ? ? 12.6 2.57
MI 2N 112 288 2.9 4.5 15.6 14.4 2.57
Colorado Railcar, bilevel 26 74 3.2? 0.96 13 18.5 2.86

*Caltrain claims the same weight – see pages 36 (which partially confuses the train with a heavier Shinkansen) and 45 of its document about bilevel EMUs. Japanese Wikipedia claims a much lower weight, coming from substituting 2 for the leading 3. Given everything else, the higher figure seems more likely (with thanks to Miles Bader for pointing the above link out).

The observation here is that FRA compliance no longer neatly separates trains. Part of it comes from the very heavy low-speed trains in France, of which the MI 2N is an example. I do not know whether this is caused by special regulations – on the one hand, the TGV reportedly has 500 tons of buff strength, but on the other hand, Sweden’s X40 is also quite heavy.

The reason for this is that while high buff strength adds weight, its effect is much larger on lightweight frames than on heavyweight frames. A train that is already heavy will become heavier if it is required to be FRA-compliant, but typically only by a few tons. New Jersey Transit’s ALP-46 locomotive is 7 tons heavier than the European locomotive it is based on, of which 4.5 come from FRA regulations. This applies equally well to low-power bilevels. Even lightweight, high-power products such as the KISS would be considered middleweight by single-level standards.

Observe, however, that to achieve acceptable average weight, FRA-compliant products have to sacrifice power (as is done in Toronto or on Caltrain) and also to have a heavy locomotive drag many relatively light coaches, raising axle load. For fast service, one must use a product like the Colorado Railcar, which is the heaviest train per unit of weight on both this table and the single-level table, and which also awkwardly is a high-level train with much greater height than permitted by any European loading gauge, avoiding the low-floor weight penalty.

Surreptitious Underfunding

One third of the MBTA’s outstanding debt, about $1.7 billion, comes from transit projects built by the state as part of a court-imposed mitigation for extra Big Dig traffic; interest on this debt is about two-thirds the agency’s total present deficit. Metra was prepared to pay for a project to rebuild rail bridges that would increase clearance below for trucks and cut the right-of-way’s width from three to two tracks. Rhode Island is spending $336 million on extending the Providence Line to Wickford Junction, with most of the money going toward building parking garages at the two new stations; Wickford Junction, in a county whose number of Boston-bound commuters is 170, is getting 1,200 parking spaces.

Supporters of transportation alternatives talk about the inequity between highway and transit funding in the US, but what they’re missing is that the transit funding bucket includes a lot of things that are manifestly not about transit. At their best, they are parking lots and other development schemes adjacent to train stations, which would’ve been cheap by themselves. At their worst, they are straight highway projects, benefiting road users only.

The situation in Boston, while unique in its brazenness, is not unique in concept. In the US, where there are no pollution taxes on fuel, the only way to mitigate air pollution is by regulation and by building alternatives simultaneously. Put another way, combined highway and transit construction is in most cases not really a combined project; it’s a highway project, plus required mitigation. Requiring the transit agency to shoulder the debt and the operating subsidies is exactly requiring transit users to pay for highways. It’s equivalent to charging transit multiple dollars per gallon of gas saved from any mode shift. And it may get even worse: the proposed House transportation bill includes a provision to allow spending national air pollution control funds on regular highway widening, in addition to the current practice of spending them on carpool lanes.

Historically, the diversion of funding from transit to roads took such insidious forms. For an instructive example from Owen Gutfreund’s book, roads advocates fought to get driver’s license fees and even inspection fees for fuel trucks recognized as road user fees, whose proceeds must be diverted toward roads. For another example from the same book, in Denver, the streetcar system was required to cover 25% of the cost of road maintenance on one-way streets and 50% on two-way streets, and as car traffic rose, streetcars both became slower and had to send over more money toward roads.

Another instructive case study is grade separations. It is to my knowledge universal that expressways and high-speed railroads, both of which must be grade-separated, pay for their own grade separations. In all other cases, who pays is determined by which mode is more powerful, and in the US, this is roads. As the national highway system was built in the 1920s, interurban railroads were required to pay for grade-separations, even when the rail came first. The practice continues today: in Kentucky, the railroad has to shoulder the full cost if it’s from 1926 or newer (Statute 177.110), and half the construction cost and the full planning cost if it’s older (177.170). In contrast, in Japan, grade separations are considered primarily a road project, and so the Chuo Line track elevation project was paid 85% by the national and city governments and only 15% by JR East (page 36). The segment in question of the Chuo Line was built in 1889; I believe, but do not know, that new rail construction in Japan is always grade-separated, at the railroad’s expense.

The situation in the US today is a surreptitious underfunding of transit, and at the same time a surreptitious overfunding of roads. It is not subject to democratic debate or even to the usual lobbyist funding formulas, but, like the obscure regulations that impede good passenger rail, hidden in rules nobody thinks to question. To pay for road mitigations and for parking, transit agencies will cut weekend service and reduce frequency. It’s bad enough when done in the open, but it’s done while claiming that transit is too expensive to provide.

Table of Train Weights

Here are some trains, and their weights. The headline figure is weight per linear meter of length, but also includes other metrics of interest. Not included is any feature of interior design, such as the number of seats or the number and location of doors, as those reflect choices about seated vs. standing capacity and about the relative importance of quick boarding and alighting.

Most trains on the list are low-speed commuter trains, but a few are high-speed. All are EMUs, except for high-speed trains with dedicated power cars and two DMUs that are included for comparison. All are single-deck except the TGV Duplex, which is as light as a single-deck TGV.

All figures are in metric units. Length and width are in meters, weight in tons, and (short-term) power in megawatts. Load is the average weight in tons per axle; it is not the same as the axle load, which is the maximum loaded weight per axle. To the best of my ability, I’ve tried to give dry weights, without passengers, though I believe the N700 Shinkansen number is with passengers.

For English units, 1 metric ton per linear meter equals 0.336 short tons per linear foot.

Train Lng Wt Width Pow P/W Ld Wt/lng
E231 Series 200 256 2.95 1.52 5.9 6.4 1.28
E231 Series motor 20 28.5 2.95 0.38 13.3 7.1 1.43
DBAG Class 423 67.4 105 3.02 2.35 22.4 10.5 1.56
Talgo AVRIL 200 315 3.2 8.8 27.9 15 1.57
E233 Series 200 319 2.95 3.36 10.5 8 1.59
FLIRT, Swiss 74 120 2.88 2.6 21.7 12 1.62
A-Train, Japan (E257) 185.5 306 2.95 2.9 9.5 8.5 1.65
Desiro Classic 41.7 69 2.83 0.55 8 11.5 1.65
E751 Series motor 20.5 34 2.98 0.58 17 8.5 1.66
DBAG Class 425 67.5 114 2.84 2.35 20.6 11.4 1.69
FLIRT, Finnish 75 132 3.2 2.6 19.7 13.2 1.76
N700 Series 405 715 3.36 17.08 23.9 11.2 1.77
CAF Regional 98 175 2.94 2.4 13.7 14.6 1.79
E351 Series 252 456 2.84 3.6 7.9 9.5 1.81
BR Class 357 83 158 2.8 1.68 10.7 9.9 1.9
TGV Duplex 200 380 2.9 8.8 23.2 14.6 1.9
X60 107 206 3.26 3 14.6 14.7 1.93
Coradia Cont., 4 cars 71 140 2.92 2.88 20.6 14 1.97
Francilien (SNCF Z 50000), 8 cars 112.5 235 3.06 2.62 11.1 13.1 2.09
Zefiro 380 215 462 3.4 10 21.6 14.4 2.15
A-Train, UK HSR (BR 395) 121 265 2.81 3.36 12.7 11 2.19
LIRR M-7 26 57.5 3.2 0.8 13.9 14.4 2.21
Velaro CN 200 447 3.27 8.8 19.7 14 2.24
MNRR M-8 26 65.5 3.2 0.8 12.2 16.4 2.52
Silverliner V 26 66.5 3.2 0.8? 12? 16.6 2.56
Colorado Railcar, 1-level 26 67 3.2? 0.96 14.3 16.8 2.59
Acela Express 202 566 3.16 9.2 16.3 17.7 2.8

The table separates Japanese, European, and American trains, the latter two with hardly any overlap. I did not include too many French and British commuter trains, and those are fairly heavy by European standards, but even they are a bit lighter than the M-7, the lightest modern FRA-compliant train (British trains tend toward 2 t/m, French trains toward slightly more). I did include the lightest European trains I know of but not all the Japanese trains, selected mainly for the big Tokyo-area workhorses (E231, E233) and longer-range, higher-speed JR East trains that I thought were comparable to the needs of longer-distance American regional lines.

Eyeballing the non-American trains, I think it’s fair and unambitious to think of a train of the future that weighs 1.8 tons per meter, can achieve 15 kW/t, and is capable of 160 km/h. Multiple vendors beat that, often by a large enough margin to cushion against the slight weight increase coming from a wider loading gauge. The upshot of this is that any regulatory overhaul and regional rail revival in the US has to be coupled with a large train order replacing older, less capable trains over time, which means dropping an order for several thousand EMUs over 20 or so years. No single company can make all of these, but sharing in the order, as was done for the R160, could work.

Commuter Rail Stop Distribution

One of the features of American commuter rail is that it’s intended to be used by suburbanites. The propensity for making nearly every station a park-and-ride, with poor pedestrian access, is one effect of this. Another effect is stop distribution. It’s not just stop spacing – many commuter lines have tighter stop spacing than some European and Japanese lines – but rather where the stops are dense and where they aren’t. Normally, a commuter line will have densely spaced stops in the city, where the population is denser and there are more connection points and important destination, and thin out in the suburbs, where speed is more important. American commuter lines are different – in the city they make very few stops, since they don’t connect well to local transit and are treated as too special, but in the suburbs, at least the inner suburbs, they have very frequent stops.

For examples, let us compare Metra and the Paris RER. I’m choosing the RER because it’s an express system, meant to provide fast service within the city rather than comparable stop distance to the subway. Some RER lines even have a slightly American-style station distribution, if they don’t go deep into suburbia, making them more like express subway lines in New York, though even then the difference is much smaller than in the US, without even such long nonstop segments as 59th-125th Streets on the A/B/C/D. Metra is where the American stop distribution tendency is the most extreme, though the lines I picked are those for which Wikipedia lists mileage for stations. All distances in the following table are in kilometers and start from the Chicago terminus or from Châtelet-Les Halles.

UP North BNSF Line Milwaukee North RER A to Marne-la-Vallée RER A to Cergy
4.5 2.9 4.7 2.8 1.8
10.5 6 10.3 4.8 4.5
15.1 11.3 13.2 7.8 9.1
17.7 14.5 14.5 12.3 10.5
19.3 15.5 16.4 14.5 14.8
21.4 16.1 18.7 ~15.5 17.5
23.2 17.7 23 17.6 18.8
24.5 18.8 26.1 20 25.6
25.4 19.8 28 22.7 29.7
26.7 21 30.3 24 ~32.5
28.5 22.1 34 30 34.8
30.9 22.7 36.9 35 38.6

Observe that the stop spacing for the first 3-5 stops is very express, but drops to that of an average subway for the Metra line beyond that. The UP-North line is especially egregious – despite serving the densely populated North Side, it barely stops there, letting the Red Line do all the work. Meanwhile, on the RER A, this is not the case – although stop spacing tightens slightly beyond the first few stops, the effect is small. Even the long nonstop segment between Etoile and La Défense (the second and third stop on the RER A to Cergy) is not enough to create the same effect seen in Chicago, and to some extent other American cities.

Bear in mind, the RER is explicitly an express railroad, though it is fare-integrated with local transit within Paris proper. Systems called S-Bahn, as well as commuter rail in Japan, range from operationally indistinguishable to operationally barely distinguishable from wholly-urban rapid transit. Thus their stop spacing is much smaller, especially in the urban core.

Part of the issue is that there’s not much development around railroads in American cities, since development follows arterial roads and urban transit instead. This is related in both directions to the failure of commuter rail to provide good urban service: there’s upzoning around subway and light rail stations, but not around commuter rail stations. But even when there is development near commuter rail stations, such as around Forest Hills in New York, service is suburban-focused (midday LIRR frequency to Forest Hills is hourly).

Whatever the ultimate cause of this, the result is that commuter rail is not usable where people are most likely to ride transit. Thus it is not too useful for a transit revival. The present revivals proceed from the inside out, starting from the urban core and expanding to outer-urban neighborhoods and then inner suburbs. At each stage, it’s useful to expand transit a little bit beyond the reach of the revival to capture additional ridership, and perhaps hit an anchor, and so there’s room for additional transit use from farther out. This is short-circuited when urban and suburban transit are kept segregated. So far it’s not been enough to prevent some transit revival in some American cities, such as New York and Washington, but it’s a problem in such cities as Boston and Chicago and may prove a problem everywhere once cities run out of subway-accessible areas.