Simutrans (https://www.simutrans.com/ https://www.simutrans.com/) is also a good option if you like this sort of thing. I like the "Simutrans Extended" version,

Simutrans (https://www.simutrans.com/ https://www.simutrans.com/) is also a good option if you like this sort of thing. I like the "Simutrans Extended" version, which is a bit more simulator-ish and fixes some silly behaviors of the base.