I happened upon this buy chance after years of wanting something up from MS train sim
https://store.steampowered.com/app/588030/Derail_Valley/
Good value at about £15.
It is of course not finished but seems to run ok my I5 based games machine.
An update is due soon to the simulation. It taught me how train brakes work. And crash. And burn. Physics is fun!
I have thought about buying that one at times. I've put a lot of hours into Transport Fever 1 & 2 which is more like the old Railroad Tycoon / Transport Tycoon games.