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.
Berlin–Hamburg Railway
On 11 May 1936, high-speed steam locomotive 05 002, hauling three express carriages and a test van, reached 200.4 km/h at the 52 km mark between Vietznitz and Paulinenaue, a world record for steam locomotives.
On 15 May 1933, Germany’s first high-speed diesel train, DRG 877 "Fliegender Hamburger" ("Flying Hamburger"), was introduced on the line. With a travel time of two hours and 18 minutes the "Fliegender Hamburger" had an average speed of for the , between Hamburg Hauptbahnhof and Berlin Lehrter station. The "Fliegender Hamburger" was the world's fastest scheduled rail service. The majority of travellers still travelled in ordinary steam-hauled express trains with a travel time of three and a half to four hours. With the outbreak of World War II, military priorities meant that high-speed projects were abandoned.