Built to crush Appalachian grades, this 775,000-pound titan hauled 13,500 tons alone, then faded within a decade, leaving behind myths, lawsuits, and two survivors guarding steam’s legacy.
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From raw numbers to living legend, the Union Pacific Challenger 3985 was a steam giant that conquered mountains and inspired generations. Its story continues today.
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See what makes Union Pacific Big Boy 4014 so special, from its 4-8-8-4 wheel arrangement to its massive articulated running gear.
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Explore Union Pacific’s DDA40X #6922, the largest diesel locomotive ever built and a true railfan legend.