Trainz Simulator 2
Select, customize, and drive a variety of trains using over a hundred prototypical routes. Pick a steam, diesel, or electric train, build and manage your own railroads, and communicate and put your efforts together with other players from around the globe to create and operate a railroad.
The 2.0.2 version of Trainz Simulator 2 for Mac is provided as a free download on our website. Our built-in antivirus scanned this Mac download and rated it as virus free. The application lies within Games, more precisely Simulation. The actual developer of this Mac application is N3V Games Pty Ltd.
From the developer:
This game is a 3D train simulator for your Mac allowing you to build and operate the railroads. You can operate a complete working rail line with interactive industries and share your creations with other rail fans. You can zoom all the way out and view your railroad from the satellite distance.
You may want to check out more software for Mac, such as Trainz Simulator, Snow Plow Train Simulator 3D - Russia or Loan Simulator, which might be similar to Trainz Simulator 2.