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Union Pacific Challenger No. 3985 is an example of a 4-6-6-4 locomotive. In the Whyte notation for classifying steam locomotives by wheel arrangement, a 4-6-6-4 is a railroad steam locomotive that has four leading wheels followed by two sets of six coupled driving wheels and four trailing wheels. 4-6-6-4's are commonly known as Challengers.
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).
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.
American Locomotive Company (ALCO) FEF-3 4-8-4 In storage as source of spare parts Union Pacific Railroad, Cheyenne, Wyoming: 844: December 1944 American Locomotive Company (ALCO) FEF-3 4-8-4 Operational Union Pacific Railroad, Cheyenne, Wyoming: 1242: T-57 4-6-0 Static display 1243: October 1890 T-57 4-6-0 Static display 2005: April 1911
[5] [7]: 18 Early American locomotives had bar frames, made from steel bar; in the 20th century they usually had cast steel frames or, in the final decades of steam locomotive design, a cast steel locomotive bed – a one-piece steel casting for the entire locomotive frame, cylinders, valve chests, steam pipes, and smokebox saddle, all as a ...
Since 1960, the Union Pacific has operated steam locomotives on a variety of excursions. These include: UP 844: a 4-8-4 Northern type express passenger steam locomotive (class FEF-3), operated in excursion service since 1960. It was the last steam locomotive built for UP and has been in continuous service since its 1944 delivery. Many people ...
Within a given country, different notations may also be employed for different kinds of locomotives, such as steam, electric, and diesel powered. Especially in steam days, wheel arrangement was an important attribute of a locomotive because there were many different types of layout adopted, each wheel being optimised for a different use (often ...
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.