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Union Pacific 4-6-6-4 Challenger Steam Engine
Union Pacific's Steam Engine 4-6-6-4 Challenger #3985
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This Loco is the largest operating steam engine gracing the Rails in the US.   Union Pacific has saved some locos, and some passenger equipment from the scrappers torch.    UP operates these engines on Excursion specials.  These Pics were taken back in July of 04 at the Denver Union Station in Downtown Denver CO.   UP and the Denver Post jointly planned the annual excursion from Denver-Wyoming for Cheyenne Frontier Days.    Ok without further ado enjoy!!!!    

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Enjoy!!!