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.
4-6-4
From 1921, 58 C28 class express passenger tank locomotives were built for the "Java Staatsspoorwegen" by three German manufacturers, Henschel & Son, Sächsische Maschinenfabrik and Maschinenfabrik Esslingen. The C28 class was one of the most popular in Indonesia, achieving speeds of up to . It was declared the world's fastest steam locomotive on gauge when it achieved . In addition, being a tank locomotive, it was able to travel at full speed in both directions.