Make a NYC Subway line please, or many in one DLC. For example, the N, Q, R, and W lines which run on the same tracks for most of the line.
Both PATH and the 7 have been done previously by a different developer in the World of Subways-series of sims. I wouldn't mind seeing the 7 in game as you'd get a good combination of elevated and underground running through some iconic spots. That being said, I don't know what security concerns the MTA would have about the subways being accurately simulated. It sure would be a fun challenge running with the NYCTA's timer signals though!
Wow, I've actually never heard of World of Subways. Looks interesting. The things you miss out on when you don't own a PC.