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  2. Union Pacific Challenger - Wikipedia

    en.wikipedia.org/wiki/Union_Pacific_Challenger

    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).

  3. Union Pacific 3985 - Wikipedia

    en.wikipedia.org/wiki/Union_Pacific_3985

    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.

  4. 4-6-6-4 - Wikipedia

    en.wikipedia.org/wiki/4-6-6-4

    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.

  5. Challenger (train) - Wikipedia

    en.wikipedia.org/wiki/Challenger_(train)

    May 1936: The Challenger makes its first run between Chicago, Illinois, and Los Angeles, California.; 1937: A second train, the San Francisco Challenger, with service between Chicago and Oakland, California is added to the lineup in cooperation with the Southern Pacific Railroad; the original train is now designated as the Los Angeles Challenger.

  6. Category:Union Pacific Railroad locomotives - Wikipedia

    en.wikipedia.org/wiki/Category:Union_Pacific...

    Category: Union Pacific Railroad locomotives. 4 languages. ... Union Pacific Challenger; Union Pacific class MK-1; Union Pacific class P-2; Union Pacific 9000 Class

  7. Union Pacific heritage fleet - Wikipedia

    en.wikipedia.org/wiki/Union_Pacific_Heritage_Fleet

    The Union Pacific heritage fleet includes commemorative and historic equipment owned by the Union Pacific Railroad.The fleet currently consists of two historic steam locomotives, three historic diesel locomotives, seventeen modern diesel locomotives in historic or commemorative paint schemes and nearly four dozen passenger cars used on office car specials and excursion trains.

  8. List of most powerful locomotives - Wikipedia

    en.wikipedia.org/wiki/List_of_most_powerful...

    Most powerful diesel-hydraulic locomotive ever built. Challenger: Union Pacific: 3950-3999 ALCO: 1936–43 Steam 4-6-6-4: 485 tonnes (535 short tons) 97,350 pounds-force (433 kN) 5,000 horsepower (3,728 kW) Two locomotives preserved, one on static display. Union Pacific 3985 operated for

  9. File:Union Pacific No. 3985 "Challenger" (September 28, 2008 ...

    en.wikipedia.org/wiki/File:Union_Pacific_No._3985...

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