![]() ![]() In 1936, Union Pacific introduced the Challenger-type ( 4-6-6-4) locomotives on its main line over the Wasatch Range between Green River and Ogden. 4014, was re-acquired by Union Pacific and rebuilt to operating condition from 2014 to 2019 for the 150th anniversary of the First transcontinental railroad, regaining the title as the largest and most powerful operating steam locomotive in the world. Today, eight Big Boys survive, with most on static display at museums across the country. They were the only locomotives to use a 4-8-8-4 wheel arrangement: four-wheel leading truck for stability entering curves, two sets of eight driving wheels and a four-wheel trailing truck to support the large firebox. In the late 1940s, they were reassigned to Cheyenne, Wyoming, where they hauled freight over Sherman Hill to Laramie, Wyoming. The 25 Big Boy locomotives were built to haul freight over the Wasatch mountains between Ogden, Utah, and Green River, Wyoming. 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 19 and operated by the Union Pacific Railroad in revenue service until 1962. 4014) operational in excursion service remainder scrappedĬost to build US$ 265,000 in 1941, equivalent to $4,882,115 in 2021 Up to 11 t (11 long tons 12 short tons) of coal per hour ![]()
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