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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. The 25 Big Boy locomotives were built to haul freight over the Wasatch Range between Ogden, Utah, and Green ...
Union Pacific 4014 is a preserved 4884-1 class 4-8-8-4 "Big Boy" type steam locomotive owned and operated by the Union Pacific (UP) as part of its heritage fleet. Built in November 1941 by American Locomotive Company (ALCO) in Schenectady, New York , it was assigned to haul heavy freight trains in the Wasatch mountain range .
4-8-8-4 Big Boys were only produced for the Union Pacific Railroad. Twenty-five such engines were built between 1941 and 1944, numbered 4000 to 4024. Eight of these locomotives survive, seven of which are on static public display at various sites in the United States.
Union Pacific’s No. 4014 steam locomotive is a massive 132-foot long engine that has been touring the rails of middle America since August. See ‘Big Boy,’ world’s largest steam locomotive ...
Hundreds gathered to see the world’s largest operating steam locomotive.
TOPEKA (KSNT) – The Union Pacific (UP) Railroad’s famous No. 4014 “Big Boy” engine will be arriving in Kansas this week to begin its journey through the Sunflower State. UP first announced ...
Union Pacific 4455 0-6-0 1920 built Photographed at Colorado Railroad Museum in 2007. CO-23 Big Boy Union Pacific #4005: Steam 4-8-8-4 Forney Transportation Museum, Denver, CO One of the few remaining examples of the world's largest steam locomotives, a 4-8-8-4 type, of which only 25 were ever built, and eight remain in museums CO-24
The largest examples were developed in the United States, where the Union Pacific Big Boy 4-8-8-4s and the Allegheny H-8 2-6-6-6s were some of the largest steam locomotives ever built, with Big Boy 4014 remaining as the largest, and last of its kind, to still operate. Many schemes for articulation were developed over the years.