LNER Class A4
The Class A4 is a class of streamlined 4-6-2 steam locomotive designed by Nigel Gresley for the London and North Eastern Railway in 1935. Their streamlined design gave them high-speed capability as well as making them instantly recognisable, and one of the class, 4468 "Mallard", holds the world record as the fastest steam locomotive. Thirty-five of the class were built to haul express passenger trains on the East Coast Main Line route from London Kings Cross via York to Newcastle, and later via Newcastle to Edinburgh, Scotland. They remained in service on the East Coast Main Line until the early 1960s when they were replaced by Deltic diesel locomotives. Several A4s saw out their remaining days until 1966 in Scotland, particularly on the Aberdeen - Glasgow express trains, for which they were used to improve the timing from 3.5 to 3 hours.
History of rail transport in Great Britain 1923–1947
The first chief mechanical engineer of the LNER was Sir Nigel Gresley, who held the post for most of the LNER's life. He was noted for his "Big Engine" policy, and is best remembered for his large express passenger locomotives, many times the holder of the world speed record for steam locomotives. LNER Class A4 4-6-2 Pacific locomotive "Mallard" still holds the land speed record for a steam locomotive. Gresley died in office in 1941.