There is a free to play train sim called MaSyzna coming out on Steam on the 14th January which has a ton of trains and rolling stock mostly focusing on Polish railways. https://store.steampowered.com/app/1033030/MaSzyna/
It looks stunning.... I have no clue what the catch will be... Edit: Okay now i understand.... Its an open source game that already exists and it will be published now on steam. So no catch You can check out more here... https://eu07.pl/en/home-page/ So no new Simulator....
Yeah I found out about MaSyzyna about 3 years ago and it's got bigger every year with new trains and routes. The latest update which came out at the end of last year added the Vectron locomotive.