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Union Pacific Big Boy

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 1959.

The Union Pacific Big Boy is the largest and historical locomotive in the world.

by AlphaRailfan April 12, 2021

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