There are several languages supported for Train Simulator.
To change the language settings in-game:
1- Right click Train Simulator in your Steam games library
2- Select properties> Language
3- Select a language from the dropdown box and click 'close'
4- Restart the game
Here is list of langauges we support:
NOTE: Some of the languages have partial support only. This means that while the core game may be translated, some DLC may not be.