British Rail Loco No. 71000 "Duke of Gloucester" built at Crewe 1954. Fitted with British Caprotti valve gear developed by Tom Daniels. Unlike other big steam locomotives, which had established great reputations in British Railways' service, 'The Duke' was a failure. A mystery steaming problem let down mechanical technology fifty years ahead of its time, and betrayed the potential of the engine to become a "World Beater". The British Caprotti poppet valve gear is considered to be of scientific importance. The complete left - hand cylinder was sent to the Science Museum, Kensington, where it remained, exhibited in sectioned form, until being put in store in 1998 and the locomotive was scrapped until it was restored in 1986.
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