Big Boy No. X4012 Key Ring

Union Pacific "Big Boy" No. 4012 is one of the world's largest steam locomotives and is one of eight preserved Union Pacific Big Boy locomotives. Built by American Locomotive Company in November 1941, Big Boy 4012 was retired in 1962 and can be viewed at Steamtown National Historic Site in Scranton, Pennsylvania. Union Pacific No. 4012, nicknamed "Big Boy", is a 4-8-8-4 type locomotive built by American Locomotive Company in November 1941. It is among the world's largest steam locomotives. One of 25 built, No. 4012 is one of eight of its type to survive the advent of the diesel era.