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Most railroad locomotives today are known as diesel-electrics. A large diesel engine drives an electrical generator, which sends power to the electric drive motors. Some are purely eletrical- they get power from an overhead line, or from a special rail on the ground- which powers the electric motors. Older locomotives were steam engines- they burned coal, and the heat turned water to steam, which powered the steam engine.

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Q: What types of engine do trains use?
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