I would like to give my opinion about what a successful train game is. Its important to give a good feel about it, and the people who like those games appreciate the sounds and see a busy intersection.
Games like Cities in Motion have barely train sounds. Many others failed because of that.
This is what I’m talking about: https://www.youtube.com/watch?v=bPlNqJMktNc
The feel that you are in an industrial place, very machine noisy and see trains coming and go all the time surplus gameplay, graphics and other things.
I think this TS video capture that very well: https://www.youtube.com/watch?v=C12aycIepqA