This London Underground line goes from Walthamstow Central to Brixton in LU 2009 stocks going up to 62 mph it was a very good line and should be in this game.
Personally I don't find the Tube interesting but I'm sure many people who do like it will back this idea.
Do you want to really spad on an ATO Route US NTSB terminology Stop Signal Overrun? ATO will result in this route being SPAD fest if not used to the 2009 Stock braking curve
Line is completely underground and completely automated. Plenty of other metro systems in the world both above ground and not automated. Try something like the new West Midlands tram or Sheffield Supertram