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.
Royal Bavarian State Railways
The one example of the Bavarian S 2/6 engine was designed and built by Anton Hammel, an engineer at the Maffei Locomotive Works, within 5 months and was displayed to the public at the 1906 Nuremberg State Exhibition. After its return from the exhibition it was taken over by the Royal Bavarian State Railways on 21 November 1906. A few months later, in July 1907, it set the world speed record for steam locomotives, recording a top speed of 154.5 km/h on the Munich to Augsburg line. Since being taken out of service in 1925 it has been preserved in the Nuremberg Transport Museum.