As of recent TS2021 keeps crashing steam and the game on my gaming PC. Specs are: Ryzen 7 3700X (8 Cores, 16 Threads) RTX 2060 6GB 32GB of RAM M.2 Storage And a game from 2009 crashes my steam and PC (sometimes)?
It might be something you installed in to TS2021 A scenario or repaint or something off the workshop Does "view reliability history" give you any clues?
Sounds like you may a issue with a recently installed mod or a workshop content, suggest uninstalling them and try again. If it is still crashing then the next step would be to do a verify integrity check. To do that just rick click on Train Simulator, then properties, then local files, then select Verify integrity of game files.