Crash unreal engine

I have a problem while starting the train simulator world game.
The game opens and goes correctly but opo 20 minutes of game crashes.

my pc:
windows 10 64 bit
intel core i7 7500u cpu 3.5 ghz
12 gb ram
nvidia geforce 940mx 2gb


If you are having issues with Train Simulator please visit: Train Simulator General Train Simulator Discussions :: Steam Community

Thank you.