You can read it here. It evolved a lot during writing, partly because of the rising costs in the Nordic countries, partly because of the tension between the forward-looking rhetoric of what the report calls the globalized system and what interviewees with more practical involvement have said, partly because of the voluminous literature on models of capital construction and maintenance that only look at Northern Europe or the UK.
In a similar manner to the webinar about the Italian and Turkish cases, there is going to be a webinar about this one. The date is the 20th of September, 17:00 Central European Summer Time (UTC+2); here is the Zoom registration page. It will take the format of a short presentation, around half an hour, to be followed by a Q&A of indefinite duration, and I will try not to be mostly negative – even with the cost overruns, Nya Tunnelbanan is noticeably cheaper per km than the average 2020s subway, and there are a lot of commendable aspects of the Nordic model of infrastructure construction including at least one (labor efficiency) that is superior to the otherwise-cheaper Southern European models.