An indestructible rail line and a station called Tax Station already exist when the map is generated, north of spawn. You cannot mine, deconstruct, damage, or drive them. Every few minutes a tax train is dispatched: you're told what it wants and roughly when it arrives, the train pulls in, and you have a limited window to load the wagons. The wagons are slot-filtered to exactly what was demanded, so you can't pay in the wrong currency. Whatever you fail to deliver is answered with a biter attack sized in proportion to the shortfall.

What's demanded grows over time and follows your own tech tree. Once you've researched advanced circuits, the taxman stops asking for iron plates and starts asking for red chips. The upcoming demand is also published on a constant combinator, so you can wire it into your factory.

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