- 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.
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- 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
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