A Civilization advance.
The steam engine is a device that uses steam to generate power. Water, heated by burning fuel (usually coal or wood), turns to steam. This steam builds up pressure inside a container with a small exit hole. Once the steam pressure is high enough, it forces its way out through the hole, pushing a turbine in the process. The spinning turbine produces power as motion or electricity (or both).
Prerequisites: Invention and Physics.
Allows for: Railroad

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