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.
Union Pacific 844 running through Painted Rocks, Nevada on September 15, 2009
FEF-2 #825 in a 1943 Union Pacific World War II publicity photo
Image: UP 814 side
Image: UP 833
American Locomotive Company
The American Locomotive Company was an American manufacturer that operated from 1901 to 1969, initially specializing in the production of locomotives but later diversifying and fabricating at various times diesel generators, automobiles, steel, tanks, munitions, oil-production equipment, as well as heat exchangers for nuclear power plants.
The Alco Schenectady plant in 1906
An Alco builder's plate on Lake Superior and Ishpeming 2-8-0 No. 24 at the National Railroad Museum
Milwaukee Road 261, a 1944 American 4-8-4 steam locomotive
American No 75214 Tr2 1319 at the Finnish Railway Museum