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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 name "Challenger" was given to steam locomotives with a 4-6-6-4 wheel arrangement: four wheels in the leading pilot truck to guide the locomotive into curves, two sets of six driving wheels, and four trailing wheels to support the rear of the engine and its massive firebox. Each set of driving wheels is driven by two steam cylinders.
Most of these locomotives were purchased or leased from the SP&S's parent roads Great Northern Railway and Northern Pacific Railway. The 4-8-4 Northerns and 4-6-6-4 Challengers were purchased new. This roster groups steam locomotives by their wheel arrangement and the railroad's designated class.
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) 340 kilonewtons (76,403 lbf) 5,369 kilowatts (7,200 hp) Fast passenger steam locomotive; the magazine Popular Mechanics cites 1941 a speed of 133.4 mph (214.7 km/h) PRR S2: Pennsylvania Railroad: 6200
Below is a table of information for the Northern Pacific Railway’s steam roster with a symbol, Whyte notation, common name and notes. (The notes were compiled by Richard Boyland and Wes Barris and first posted May 30, 1991, to the electronic newsgroup rec.railroad.) Included is a breakdown of the Northern Pacific classes, along with the date ...
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.
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 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 Baldwin Locomotive Works (BLW) MK-1: 2-8-2: Static display Ross Park in Pocatello, Idaho. 2295: June 1920 American Locomotive Company (ALCO) MK-9 2-8 ...