Start on a small island that can only be expanded by research. Infinite ore patches can be placed by hand and removed by the OreEraser tool.
Scenarios, maps, and puzzles.
Map generation and terrain modification.
Configurable default behavior for temporary train stops.
Small changes concerning balance, gameplay, or graphics.
Transportation of the player, be it vehicles or teleporters.
Trains are great, but what if they could do even more?