I am running the game on a Macbook Pro 13-inch from late 2013:
OS: 10.9.4 13E28 Processor: 2.6 GHz Intel i5, Memory: 8 Gb 1600MHz DDR3, Graphics: Intel Iris
My game occasionally crashes during an autosave. It usually occurs when I am placing high demand on the system e.g. playing on high speed while changing viewing angles and then an autosave occurs. The system freezes for a while (~1min) and then exits with a report that Train Fever quit unexpectedly. This game is still playable, and the autosave that crashed the system is even valid, so I don’t really lose any time at all. Just wanted to bring it to your attention.
P.S. Thanks for the last update, makes the game playable now. However, I found that I could play the un-updated Mac version if I restarted my computer before opening the game.