| http://www.w3.org/ns/prov#value | - The B&O started developing steam locomotives in 1829 with Peter Cooper's Tom Thumb.[6] This was the first American-built locomotive to run in the U.S., although it was intended as a demonstration of the potential of steam traction, rather than as a revenue-earning locomotive.[5]:96 Many of the earliest locomotives for American railroads were imported from England, including the Stourbridge Lion an
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