It needs updated.

Runs on my 2010 MacBook Air just fine but the game has some issues. The first one was, during the tutorial, I got locked in the train window and couldn’t exit. Then I noticed trains getting stuck on the track. Looks like you have to create multiple tracks and there’s no warning if you have more then one train on a track at a time. I just quickly lost interest and I’m now looking for another train game. Two stars for the lack of an update to fix issues. I don’t want to get too envolved in this game and possibly come across more issues.

PoseMotion about Sid Meier's Railroads!