Trainz

Trainz is an ongoing series of 3D train simulator video games produced by the Australian studio N3V Games (formerly Auran), the first installment being released in October of 2001. Each installment of the series implements realistic or fictional simulated railway operations (Driver) alongside the ability to create custom maps (Surveyor) and contains a vast collection of real-life rolling stock for the user to drive in their maps.

One of the most revered aspects of Trainz is the ability to support user-created custom content (trains, scenery, maps), with over millions of assets to choose from, created by thousands of members of the Trainz community. The ability to support custom content was originally introduced in Trainz 1.1.1, but was not officially marketed until the release of Trainz Driver 2.