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.
Meiningen Steam Locomotive Works
In the 1960s, construction began on new snow ploughs for the DR in East Germany as well as the conversion of steam locomotives to oil-firing. At the same time the refurbishment of diesel locomotives was taken on. The number of employees hovered around 2,000. In 1961 the former streamliner, 61 002, was converted by the factory into the high-speed, trial locomotive, 18 201, which is still operational today. This engine reached a top speed of 180 km/h and is currently the fastest, operational steam locomotive in the world. In 1981 the construction of fireless locomotives and S-Bahn bogies began, whilst the repair of steam locomotives steadily waned.