Union Pacific FEF series
Three classes of American 4-8-4 locomotives / From Wikipedia, the free encyclopedia
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The Union Pacific FEF series consists of 45 4-8-4 "Northern" steam locomotives built by the American Locomotive Company (ALCO) between 1937 and 1944 and operated by the Union Pacific Railroad until 1959. Like other Union Pacific steam classes, the acronym comes from the first letter of the spelling of its wheel arrangement: Four Eight Four.
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The final steam locomotives built for the Union Pacific, the FEFs represented the apex of dual-service steam locomotive development in the United States, as funds and research were thereafter concentrated into the development of diesel-electric locomotives. Designed to burn coal, they were converted to run on fuel oil in 1946.[1] They pulled a variety of passenger trains, such as the Overland Limited, Los Angeles Limited, Portland Rose and Challenger,[2] until diesel-electric locomotives took over passenger service. Many FEF series locomotives were reassigned to freight service during the last years of their careers.
Four FEF series locomotives survive, including No. 844, which remains in operational condition and runs in excursion service. The 844 is one of the Union Pacific's oldest serving locomotives[3] and the only steam locomotive never retired by a North American Class I railroad.[4]