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In page George Stephenson:
"Stephenson was hired to build the eight-mile (13-km) Hetton colliery railway in 1820. He used a combination of gravity on downward inclines and locomotives for level and upward stretches. This, the first railway using no animal power, opened in 1822. This line used a gauge of 4 ft 8 in (1,422 mm) which Stephenson had used before at the Killingworth wagonway.[1] Other locomotives includeThe Duke for the Kilmarnock and Troon Railway (1817–1824).[citation needed]
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