UP #3985 Challenger Departing Kansas City!

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UP #3985 Challenger Departing Kansas City! | Train Fanatics Videos
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Just a glimpse of what we can expect once UP#3985 4-6-6-4 Challenger is back up and running! But first, Big Boy needs to get finished!

Built specifically to take on long grades like her cousins the “Big Boys” 4-8-8-4’s, the #3985 Challenger was designed to pull freight fast up long grades without helper engines.

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Currently, UP’s #3985 Challenger 4-6-6-4 is undergoing renovation as Union Pacific’s steam shop in Cheyenne, Wyoming.

Since the #3985 was so long, she was built as an articulated locomotive that allows the 4 wheel front truck to go with the bend in tracks which would have otherwise be troublesome to such a long boiler. Hence, she can articulate herself around the curves because the front of the boiler sits on top of this truck much the same way a big rig diesel truck hooks up to its’ trailer.

Some quick facts about the UP #3985 Challenger

  • Builder – American Locomotive Works – 1943
  • Wheel configuration – 4-6-6-4
  • Locomotive and tender weight – 1,073,900 lbs
  • Tractive effort – 97,350 lbf
  • Nicknamed – Challenger

Let us know if you have ever had a chance to see UP #3985 in action! We would love to hear about your experience!

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