Union Pacific No. 3975

Union Pacific No. 3975 was a class 4664-4 4-6-6-4 Challenger Steam Locomotive, built in 1943 by the American Locomotive Co. for Union Pacific railroad. The Challengers were designed & primarily used for freight service, but occasionally assigned to passenger duty through the mountains of California and Oregon. The locomotive was renumbered 3708 in 1952, pulled its last "revenue" train in 1957 and scrapped in 1960.
==Pics==
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==Refs==
* 1936~1944_ALCo.4664\Challenger~UP#3900~3999 Dimensions
Category:Steam locomotives
Category:Tender locomotives
Category:American locomotives
Category:4-6-6-4 locomotives
Category:4-6-6-4 steam locomotives
Category:ALCO locomotives
Category:Built in 1943
Category:Scrapped locomotives
Category:Articulated locomotives
Category:Union Pacific locomotives
Category:Locomotives
Category:Standard gauge locomotives
Category:Standard gauge locomotives of the United States
Category:4 foot 8 1⁄2 inch gauge
Category:Scrapped steam locomotives