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.
Referred to as an "articulated" locomotive, because it has more than one set of drivers, Big Boy weighs 1,250,000 pounds (570,000 kg).
This locomotive worked for 20 years hauling freight between Cheyenne, Wyoming and Ogden, Utah, logging over 1,000,000 miles (1,600,000 km) before its retirement in 1962.
4012 was originally on display at Steamtown, USA in Bellows Falls, Vermont until 1984 when...