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Challenge Accepted

Back in the day, Union Pacific didn't require steam powered passenger specials to have diesel locomotive helpers.

 

Case it point, 4-6-6-4 "Challenger" No. 3985 capably leads a 17-car "Pacific Limited" charter up the 1.14% grade through Echo Canyon at Castle Rock, Utah on Aug. 2, 1992.

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Uploaded on January 8, 2025
Taken on August 2, 1992