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Puffing Billy enginePuffing Billy, steam engine invented by William Headley in 1813. Headley solved the problem of slippage on the iron tracks by applying power through two sets of driving wheels
Evidence of side movement, Tirpentwys Colliery, South WalesEvidence of side movement, with a broken prop on the left, in a coal seam at Tirpentwys Colliery, near Pontypool in South Wales
