Big Boy Steam Engine
Cheyenne | Park to Park
Even in retirement, Old Number 4004 remains an imposing sight. The world's largest steam locomotive, this powerful coal-fired engine was designed to pull a 3600-ton train over steep grades between Cheyenne, WY and Ogden, Utah. The 4004 is one of the eight remaining Big Boys on display throughout the country.
On display year-round in Holliday Park.
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