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.
London King's Cross railway station
A number of famous trains have been associated with King's Cross, such as the Flying Scotsman service to Edinburgh. The Gresley A3 and later streamlined A4 Pacific steam locomotives handled express services from the 1930s until 1966. The most famous of these was "Mallard", which holds the world speed record for steam locomotives at , set in 1938.