Milwaukee Road class F7
The F7s are major contenders for the fastest steam locomotives ever built, as they ran at over daily. One run in January 1941 recorded by a reporter for "Trains" magazine saw achieved twice—in the midst of a heavy snowstorm. Baron Gérard Vuillet, a French railroading expert, once recorded a run between Chicago and Milwaukee where the locomotive reached and sustained an average for . However, the British locomotive LNER Class A4 4468 "Mallard" is officially accepted to be the world's fastest, with a run recorded at but authenticated at 126 mph in 1938.
Charles Rous-Marten
He is chiefly known for recording a speed of 102.3 mph on the 'Ocean Mail' special from Plymouth to London hauled by GWR locomotive 3440 City of Truro on 9 May 1904, the first time that a steam locomotive was recorded to have achieved 100 mph.