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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.
Most powerful steam locomotive ever static tested. PRR S1: Pennsylvania Railroad: 6100 Altoona Works: 1939 Steam 6-4-4-6: 487 tonnes (537 short tons) 76,403 pounds-force (340 kN) 7,200 horsepower (5,369 kW) Fast passenger steam locomotive; the magazine Popular Mechanics cites 1941 a speed of 133.4 mph (214.7 km/h) PRR S2: Pennsylvania Railroad ...
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 ...
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.
Both of the Northern Pacific's 2-6-6-2 classes were copies of GN designs, including their Belpaire fireboxes, a rarity on NP steam locomotives. NP 3015, last of the Class Z's, had a troubled existence, suffering a crown sheet failure at Kennedy, Washington , on Stampede Pass circa 1916, then later derailing on the Wallace Branch in Idaho in 1933.
Among Alco's better-known steam locomotives were the 4-6-4 Hudson, 4-8-2 Mohawk, and the 4-8-4 Niagara built for the New York Central; and the 4-8-4 FEF and the 4-6-6-4 Challenger built for the Union Pacific. Alco built many of the biggest locomotives ever constructed, including Union Pacific's Big Boy .
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