The Union Pacific Challengers were a type of simple articulated 4-6-6-4 steam locomotive built by American Locomotive Company for the Union Pacific. 105 of these locomotives were built between 1936 and 1943. The Challengers were about 122 ft (37 m) long and weighed 284,000 kg. Primarily in freight service, they operated over most of the Union Pacific system. A few were assigned to passenger trains operating through mountain territory to California and Oregon. The Locomotives were built specifically for UP and much of the experience gained later went into the design of the famous FeaturesSynchronized PUFFING SMOKE with Chuff SoundSeparate whistle smokeVariable Puffing Smoke Intensity and timingIntegral DCC Decoder with Back EMF for Industry Best Slow Speed Operation in DC and DCCPrecision Drive Mechanism engineered for continuous heavy load towing and smooth slow speed operationPowerful High Torque Motor with Fly WheelPremium Caliber Painting with Authentic Paint SchemesSpecificationsScale Type: HO-Scale
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