Hello, have you read the “Most common issues” on point 2:
2. You are using a laptop and the game does not work
If you are using a laptop with two graphics cards, make sure that you select the dedicated / more powerful card as the primary device in the graphics card settings. It’s a very common problem that the less powerful graphics card is set as the primary device and as a consequences, games do not run.
Therefore a small howto:
1. Open the Nvidia control panel
2. Open the tab 3D-settings -> 3D-settings management
3. locate the .EXE from train fever (c:\program files(x86)\steam\steamapps\common\trainfever\trainfever.exe)
4. select the dedicated GPU
5. click apply6. have fun!