Nigel Gresley
Sir Herbert Nigel Gresley (19 June 1876 – 5 April 1941) was an English railway engineer. He was one of Britain's most famous steam locomotive engineers, who rose to become Chief Mechanical Engineer (CME) of the London and North Eastern Railway (LNER). He was the designer of some of the most famous steam locomotives in Britain, including the LNER Class A1 and LNER Class A4 4-6-2 Pacific engines. An A1 Pacific, "Flying Scotsman", was the first steam locomotive officially recorded over 100 mph in passenger service, and an A4, number 4468 "Mallard", still holds the record for being the fastest steam locomotive in the world (126 mph).
Race to the North
On the East Coast route, GNR locomotives ran on what was undoubtedly the fastest line in the world but the ""Flying Scotsman"" service was not their fastest train – compared with, say, on routes with more competition. A wide variety of locomotives was in use – the Patrick Stirling 4-2-2 "8-foot" singles, complemented with his 2-2-2 "7-foot 6" singles, were outstanding for speed and reliability, being capable of on flat terrain. The latest express NER engines were Tennant 2-4-0s and the T.W. Worsdell–von Borries compound Worsdell 'F' 4-4-0s which were powerful, although not so fast.
Having compound engines required the development of sufficiently strong steel connecting rods for fast running and the 4-4-0s developed from 2-4-0s when it was found that a front bogie gave greater high speed stability. The East Coast route had no severe gradients and was slightly shorter than the west.