Sure gushing over some bus, trains, or other public transport systems technical details can be fun but
God I wish more people would do analyses of systems from a project management/execution dynamics angle 
Stuff like:
- How do you plan it (be it a new or expansion project)
- How do you convince whoever is in power to build it (and what compromises have to be made, is any)
- How do you convince people to give up their [money, land, whatevers] so you have the funds and space to build it
- How do you manage it in day-to-day operation and keep service levels high
- And, just as important, how do you keep it resilient against crap like governmental turnover
I have a couple local books that talks about adjacent topics but I'd love to see those from foreign systems too 
I mean yes I know these are like "boring" "soft" "managerial" topics but those great trains buses and whatnot doesn't come out of thin air so I want to learn about the behind the scenes stuffs
From conception to building to operation to maintenance, and what kinda crap they have to deal along the way of it
IMO they aren't boring, but they're unpleasant, insofar they ~require one to consider how to ~manipulate people (c.f. Granny Weatherwax's description of sin).
