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Captain James Kirk and Doctor Leonard McCoy discovered in 2268 that the people of Neural, with Klingon technical assistance, had learned to use coal to forge flintlocks and sulfur to manufacture gunpowder. (TOS: "A Private Little War")
In a 2370 holodeck simulation of the Orient Express, the train had a locomotive powered by coal. In order to increase the train's speed, Worf helped in stoking coal into the boiler. (TNG: "Emergence")