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The Union Pacific Big Boy is a type of simple articulated 4-8-8-4 steam locomotive manufactured by the American Locomotive Company (ALCO) between 1941 and 1944 and operated by the Union Pacific Railroad in revenue service until 1962.
See the world's largest operating steam locomotive, Big Boy No. 4014, on its Westward Bound Tour from Wyoming to California in July 2024. Find out the dates, times and locations of the public whistle-stops, displays and excursions along the way.
Learn about the history and features of the Big Boy, the largest and most powerful steam locomotive ever built for Union Pacific Railroad. See photos, vital statistics, and how it was restored and returned to service in 2019.
- Coal**56,000 lbs.
- 14-wheeled
- 4 ft. 8-1/2 in.
- 25,000 gallons
Feb 2, 2024 · Learn about the history, specifications, and photos of UP's legendary 4-8-8-4 "Big Boy" steam engines, designed to tackle the Wasatch Mountains. Find out how one of these behemoths was restored and returned to service in 2019.
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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.