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Union Pacific 4012
Union Pacific 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.
==History==
Union Pacific 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 . This locomotive worked for 20 years hauling freight between Cheyenne, Wyoming and Ogden, Utah, logging over before its retirement in 1962.
4012 was originally on display at Steamtown, U.S.A in Bellows Falls, Vermont until 1984 when Steamtown USA moved to Scranton, Pennsylvania.〔 Since the Steamtown turntable and roundhouse are too small to accommodate the size and weight of 4012,〔 it has remained out-of-doors since its arrival at Scranton.
The Steamtown Special History Study recommended that this locomotive remain at Steamtown because it is the only articulated locomotive in the Steamtown USA collection and recommended that due to its good condition, 4012 could be restored to working order. However, the study also recommended that 4012 remain on static display, because it is doubtful that the "track, switches, culverts, trestles, bridges, wyes, turntables, and other facilities that would have to carry her () bear her great weight".〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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