'The Mallard' 4-6-2 steam locomotive, 1938. Mal
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'The Mallard' 4-6-2 steam locomotive, 1938. The Mallard and the dynamometer car stand at Barkston on Sunday 3 July 1938, only minutes away from the run that brought it a world speed record. This class A4 locomotive was designed by Sir Nigel Gresley, the chief mechanical engineer for the London & North Eastern Railway and was built at the railway's works in Doncaster. The Mallard reached a speed of 126 mph on a straight stretch of track between Grantham and Peterborough, achieving a new world record for steam locomotives which remains unbroken to this day.