Personally I'm hoping the thing that people have been asking for since the game has been released is the ability for some sort of rudimentary timetabling to stop vehicles from crowding up. This has been asked for since before the game was released, actually, and it would be great to finally see it done.
Then again, in the European context light rail tends to be considered a variant of the tram (and light rail systems often share rolling stock with tramways). The best way to implement Light Rail would (in my opinion anyway) be to add the options for tunnels and elevated track to the trams.-How about Light Rail? Light Rails are really prevalent in North America. The trains tend to be larger, longer and operate at higher speeds then trams. Basically acting like a cheaper version of heavy rail in the United States. Light rails should have all the abilities of the metro.