![]() ![]() It's basis Union Pacific Challenger 4-6-6-4 Union Pacific 3985 is painted black with white lining and a grey smokebox. ![]() 3985 was officially retired from excursion service as a result of its poor condition. It remained in operation until mechanical problems took it offline in 2010, after which it was stored at the Union Pacific's Steam Shops in Cheyenne, Wyoming. 3985 was placed into excursion service as part of the Union Pacific's heritage fleet and became the largest operational steam locomotive in the world, a title it would hold until the restoration of Union Pacific Big Boy No. After a group of Union Pacific employees restored the locomotive to running condition in 1981, No. It was initially stored at the roundhouse in Cheyenne, Wyoming until 1975, when it was placed outdoors beside the Cheyenne depot. The locomotive operated in revenue service until 1957. 3985 is one of only two Union Pacific Challengers left in existence, and the only one to have operated in excursion service. Built in July 1943 by the American Locomotive Company (ALCO) of Schenectady, New York, No. Union Pacific 3985, also known as the "Challenger", is a four-cylinder simple articulated 4-6-6-4 "Challenger" type steam locomotive owned and previously operated by the Union Pacific Railroad. Union Pacific 3985 is a 4-6-6-4 American tender engine and a recurring background engine. 5 High Harrington Ironworks Neilson 0-4-0ST.
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