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The Milwaukee Road's class F7 comprised six (#100–#105) high-speed, streamlined 4-6-4 "Baltic" or "Hudson" type steam locomotives built by Alco in 1937–38 to haul the Milwaukee's ''Hiawatha'' express passenger trains. Following on from the success of the road's class A 4-4-2s, the F7s allowed the road to haul heavier trains on the popular Chicago–Twin Cities routes. 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 in 1938. The Milwaukee F7s are accepted as the fastest steam locomotives by a different measure—scheduled speed between stations. In 1939, shortly after they were introduced into passenger service, the ''Twin Cities Hiawatha'' schedule was modified such that the engines would need to run the between Portage and Sparta, Wisconsin in 58 minutes—a start-to-stop average of . First-built #100 was also the first withdrawn from service, on November 10, 1949; last-built #105 was the final one in service, withdrawn August 10, 1951. All were scrapped. == See also == * CNW Class E-4 - nine very similar 4-6-4 locomotives built for the Milwaukee's Chicago competitor, the Chicago and North Western Railway. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Milwaukee Road class F7」の詳細全文を読む スポンサード リンク
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