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.
Sentetsu Pashi class locomotives
In total, there were 144 Pashi type locomotives of five distinct classes built for Sentetsu:Of these, the Pashishi class was the most numerous, and the Pashiko class was the heaviest and fastest steam locomotive ever to be operated by a Korean railway company.