Aelia, check the second link in my first post, i think that will answer your question. I think you can compare it a little with the flightsimulator scene. There are entire communities who set up virtual airline companies, with flights right on schedule, the whole works, just like in real life.
I think it's the same with this game. Not that i'm gonna join a community like that, i don't have the time to set up a virtual railroadcompany, and make sure all the trains run on time.
But just look at the screenshots, it defenitely looks very realistic.