If you are strictly looking for a free train simulator, consider these open-source options:

Before you buy, ensure your rig can handle the heavy physics calculations: Windows 7, 8, 10, or 11 (64-bit recommended). Processor: Intel Core i5 or better. Memory: 8 GB RAM minimum.

: Run 8 uses a specific license-per-computer system; unauthorized copies typically will not work in multiplayer or receive critical updates. Security Risks