I didn't want to hijack Mudwrestle's progress shots in the thread where I was asked what game the model train I made would be in (BTW again I say great work Mudwrestle!). It's made for Cities Skylines....a city building game like Sim City 4 but in 3D. It was just released in March.
http://store.steampowered.com/app/255710/Here are some preview shots. I'm releasing the first volume of a SMEE train set within 24 hours of this post.
Original model made in Sketchup
I will put a link when they go live. The only thing is the game is still young and don't have elevated stations yet. But the modding community is going in hard.