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Wikipedia Definition
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 for its heritage fleet. Built in July 1943 by the American Locomotive Company (ALCO) of Schenectady, New York, No. 3985 is one of only two Union Pacific Challengers left in existence and the only one to have operated in excursion service.
The locomotive operated in revenue service until 1957. It was initially stored at the roundhouse in Cheyenne, Wyoming until 1975, when it was placed outdoors beside the Cheyenne depot. After a group of Union Pacific employees restored the locomotive to operating condition in March 1981, No. 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 the 4-8-8-4 Union Pacific Big Boy No. 4014 in May, 2019. 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.
Original Design.
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 for its heritage fleet. Built in July 1943 by the American Locomotive Company (ALCO) of Schenectady, New York, No. 3985 is one of only two Union Pacific Challengers left in existence and the only one to have operated in excursion service.
The locomotive operated in revenue service until 1957. It was initially stored at the roundhouse in Cheyenne, Wyoming until 1975, when it was placed outdoors beside the Cheyenne depot. After a group of Union Pacific employees restored the locomotive to operating condition in March 1981, No. 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 the 4-8-8-4 Union Pacific Big Boy No. 4014 in May, 2019. 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.
Original Design.
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looks hotttter than hell lol 😂