Old Number 4004 is one of eight remaining Big Boys in the U.S., the world's
largest steam locomotive. The powerful coal-fired engine was designed to pull a
3,600-ton train over steep grades between Cheyenne, Wyoming, and Ogden, Utah.
Contact: Big Boy Steam Engine, Holliday
Park, 17th Street and Morrie Avenue, Cheyenne, Wyoming 82001; 307-637-6423.
