Simutrans is an open-source transportation simulation game available for Windows, Mac, and Linux. Establish a successful transport company: Build road, rails, channels and more to get passengers, mail, and goods to their destinations.
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Pro Multiple paksets
There are multiple graphic packages to choose from, each with different dynamics. So even though you have mastered one pakset you can have a different gameplay with another.
Pro Passengers & goods have their own travel destinations
Each product has a chosen destination and they will only use your company if you deliver them where they want.
Pro Cross platform
Available for Windows, Mac, Linux & Steam-OS.
Pro Map customisation
The map has multiple customisation options, like map size, climate zones, terrain 'roughness' and number of rivers, cities, industries and tourist attractions, & more.
Creating new objects is not too hard, as long as you have some drawing skills you just need a text file with some parameters and then you can compile it to enjoy. Some paksets even rely on rendering from 3D objects.
Pro Available through Steam
Simutrans is available through Steam for those who prefer automatic updates and game management through Steam.