LNER Class A4 4468 Mallard
London and North Eastern Railway locomotive numbered 4468 "Mallard" is a Class A4 4-6-2 Pacific steam locomotive built at Doncaster Works, England in 1938. It is historically significant as the holder of the world speed record for steam locomotives at .
High-speed rail in the United Kingdom
Various claims exist for the first locomotive to break the barrier, notably the Great Western Railway's "City of Truro" (1904) and the LNER's "Flying Scotsman" (1934). Locomotive power capable of reaching has existed in Britain since 1938, when the LNER's "Mallard" broke the steam locomotive speed record.