Big Boy No. 4014, the largest steam locomotive in the world is stopped in Willcox, Arizona.
Black and white image of the front of Union Pacific's Big Boy locomotive in Willcox, Arizona.
Sign on Big Boy 4014 from American Locomotive Company Schenectady Works November 1941.
Union Pacific's Big Boy No. 4014 steam locomotive approaching Benson, Arizona. Big Boy is the largest steam locomotive in the world and the last one running.
Last railcar of Union Pacific's Big Boy Tour in Cochise County Arizona.
The only Big Boy steam locomotive still running passes between Tucson and Willcox Arizona.