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.
LNER Peppercorn Class A1 60163 Tornado
60163 "Tornado" is a main line coal-fired steam locomotive built in Darlington, County Durham, England. Completed in 2008, "Tornado" was the first such locomotive built in the United Kingdom since "Evening Star", the last steam locomotive built by British Railways in 1960. It is the only example of an LNER Peppercorn Class A1 locomotive in existence, the entirety of the original production batch having been scrapped without preservation. The locomotive's namesake is the Panavia Tornado, a combat aircraft flown by the Royal Air Force. In April 2017, "Tornado" became the first steam locomotive to officially reach 100 mph in over 50 years on British tracks.