OpenTTD - An open-source clone of the classic game ...
Open Rails - Open Rails is an open source simulator that is designed to run Microsoft Train Simulator content.
The Paradise Cove - The Paradise Cove is playable, Action-Adventure, Casual, Building, Management, Massively Multiplayer Online, and RTS Simulation created and published by Pocket Games.
openBVE - openBVE is an open source train simulator
RollerCoaster Tycoon Classic - Create and run amazing parks on your iPhone or Android.
Microsoft Train Simulator - Microsoft Train Simulator was a commercial train simulator for Microsoft Windows.