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 .
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.