There are also free, open-source train simulators available, though they might not offer the same level of realism or extensive content as Train Simulator or Train Sim World.
Run 8 is a train simulator game that offers a detailed and immersive experience for train enthusiasts and simulation fans. The game is known for its realistic depiction of train operations, challenging players to manage their own railroad company. It includes various scenarios, a dynamic weather system, and day/night cycles, contributing to a highly engaging experience. Run 8 Train Simulator -Including DLC Add-ons- Crackl