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Challenger Steam Locomotive Specifications

 
Union Pacific 3985, an Alco built, Otto Jabelmann designed 4-6-6-4 Challenger steam locomotive, head south from the diesel service facility to the Salt Lake City passenger depot, where it will take an excursion passenger train from Salt Lake to Provo, Utah. Passing on the left is a Rio Grande freight train.
union pacific challenger locomotive.
(John R. Doughty, Jr. photo)
 
  • Union Pacific Challenger – 4-6-6-4
    articulated steam locomotive
  • First ordered – August, 1936 (3900 – 3914)
  • Jabelmann design order – July, 1942 (3950 – 3969)
  • Total production - 105
  • Drive wheel diameter – 69 in.
  • Boiler – 94-11/16 in.
  • Boiler pressure – 280 lbs.
  • Firebox length – 187-1/32 in.
  • Firebox width – 108-3/16 in.
  • Length – 106 ft., 8 in.
  • Cylinders – 21 in. diameter, 32 in. stroke
  • Tubes – forty-five 2/1-4 inch diameter
    and177 four-inch diameter,
    each 20 feet long.
  • Maximum tractive power – 97,350 lbs.
  • Water – 25,000 gallons
  • Fuel – 28 tons of coal, or oil burner
 
Challengers are in "Thunder in Weber Canyon", "Union Pacific 3977" and "Union Pacific 3985".
 
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