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Union Pacific 3985 is a four-cylinder simple articulated 4-6-6-4 "Challenger"-type steam locomotive built in July 1943 by the American Locomotive Company (ALCO) of Schenectady, New York, for the Union Pacific Railroad. No. 3985 is one of only two Challengers still in existence and the only one to have operated in excursion service.
The Union Pacific Challengers are a type of simple articulated 4-6-6-4 steam locomotive built by American Locomotive Company (ALCO) from 1936 to 1944 and operated by the Union Pacific Railroad until the late 1950s. A total of 105 Challengers were built in five classes. They were nearly 122 ft (37 m) long and weighed 537 short tons (487 tonnes).
An expansion for the Union Pacific Challenger class was the Union Pacific Big Boy class, being a 4-8-8-4, instead of a 4-6-6-4. Today, the only Challenger locomotives that survive were both owned by Union Pacific. One such locomotive, Union Pacific 3985, was operated by the Union Pacific Railroad in excursion service from 1981 to 2010, when ...
UP 3985: a 4-6-6-4 "Challenger" class dual-service steam locomotive, operated in excursion service from 1981 to 2010 and was retired as of January 2020. Delivered in ...
Union Pacific No. 119; Union Pacific 618; Union Pacific 737; Union Pacific 844; Union Pacific 1243; Union Pacific 1982; Union Pacific heritage fleet; Oregon Railroad and Navigation 197; Union Pacific 3985; Union Pacific Big Boy; Union Pacific 4012; Union Pacific 4014; Union Pacific 4023; Union Pacific 4141; Union Pacific 4466; Union Pacific ...
The Challenger name has also been applied to the 4-6-6-4 type steam-driven locomotives, the first of which were designed by the UP and built by the American Locomotive Company between 1936 and 1943. Best known among these is Union Pacific 3985, one of 105 Challengers built for the railroad.
Several Alco mainline locomotives are still operational, including Union Pacific 844, Union Pacific Big Boy 4014, Milwaukee Road 261, Soo Line 1003, and Florida East Coast 148. UP Challenger 3985 ran in UP excursion service until 2010, but is now being restored by the Railroad Heritage of Midwest America museum. [26]
No. 1218 is the sole survivor of the Norfolk and Western's class A locomotives and the only surviving 2-6-6-4 steam locomotive in the world. While smaller than Union Pacific's famous and more numerous "Challenger" class of 4-6-6-4 locomotives, Norfolk and Western's design racked up unmatched records of performance in service.