So, being a fan of streetcars and subways, I created a version for cities, called City Rails. The New York City play test version was complete with rules, map, and cards. We had a lot of fun with it, but it didn't go too far with Mayfair probably due to the lack of marketability, despite it's high playability.
I've got maps done for both Berlin and London, and future plans had called for Chicago, Tokyo, Los Angeles and others.
This is the Box Art, for now. Obviously, the game is set prior to 2001, as you see the prominent twin towers in the skyline.