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The Union Pacific Railroad's No. 3985 "Challenger" steam locomotive pulls away from the steam shop in Cheyenne, Wy to begin a tour to celebrate railroad heritage.  The Challenger is the world's largest operating steam locomotive and will be on a five state, 1,750 mile tour from Cheyenne, Wy to St. Paul, Minn.  Michael Smith/staff
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The Union Pacific Railroad's No. 3985 "Challenger" steam locomotive pulls away from the steam shop in Cheyenne, Wy to begin a tour to celebrate railroad heritage. The Challenger is the world's largest operating steam locomotive and will be on a five state, 1,750 mile tour from Cheyenne, Wy to St. Paul, Minn. Michael Smith/staff