This could be something. But it's fun for 15 minutes, then it's enough. You can not design you own trains nor your own terrain. I know this would require some other kind of programming, but it could be a kind of open to everyone to send in your own train. I feel there is more in this, but the developer seems to lacks time (and money?) to really make something out of this.

Also I don't like the big train in the bottom half of the screen, I want to switch that off, but that's not possible. And I think $25 is too much. $10 would be more appropriate, but then again, it needs more features. Network connection to be on the same track as my friend?