"The Mighty Big Boy"

Number 4004 is one of eight surviving examples of the world's largest steam locomotives. The Union Pacific Railroad had 25 of these goliaths built at a cost of over a quarter million dollars each. Number 4004 ran primarily between Cheyenne and Ogden, Utah. It was retired from service on October 31, 1958, after running 440545 miles, and was placed on this site on June 28, 1963.

Cheyenne, Wyoming · United States