First off, all the files you need to make a map are included! All the road pieces, railway pieces, traffic lights are completely modular, so all you need to do is start placing them on another map. I'd encourage anyone to do this, if what you make is nice, then I'm happy for you to release it to the rest of the community. (though please ask my permission first). As I said before, if someone wanted the actual blender files to modify the objects, then just ask me. Secondly, you need to spawn the train yourself, then use the terrain editor (F11) to move it on to the track. Cheers.
I did say it's released as is, it's not meant to be finished. (I can't work on it since I'm at Uni with a crap computer at the moment) Hopefully it's fun to play around with anyway :/