Union Pacific's Challenger 3977 steam locomotive built by American Locomotive Company at Cody Park Railroad Museum. North Platte, NE.

Union Pacific's Challenger 3977 steam locomotive (1943) built by American Locomotive Company at Cody Park Railroad Museum. North Platte, NE.

Union Pacific's Challenger 3977 steam locomotive (1943) built by American Locomotive Company at Cody Park Railroad Museum. North Platte, NE.
Photo by Jim Steinhart © 2011, all rights reserved. (Ref: NEPR12)

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