One more interesting system that myself, along with Peter (Narrowgauge) and others, worked on is the Chicago Tunnel Company. When we stopped work, we had the entire tunnel system laid out covering around 5 square miles of trackage under almost every street in the Loop area as well as across the river. Track (tunnels, actually) with overhead electircal catenary, rolling stock, motive power, and other goodies were built as well as some of the basements to major buildings and freight elevators able to take an entire railcar.
I think I used TS2010 for this project, but I don't see why it couldn't be brought into TS12 or even T:ANE if there was enough interest.
Bill