Transport Fever (1 or 2): lovely games that have really detailed 3D graphics, the UI/UX in TF2 is the best that i've every played with, however the train pathing doesn't appear to be dynamic, only simple signals present OpenTTD: free, open source, has a variety of transport, even crashes, low hardware requirements, but personally the train tiles aren't easy on the eyes Here's some of the other similar games that i enjoy:
