![]() Hauling a 3,600-short-ton (3,300 t 3,200-long-ton) freight train demanded double heading and helper operations, which slowed service. For most of the route, the maximum grade is 0.82% in either direction, but the climb eastward from Ogden, into the Wasatch Range, reached 1.14%. 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. It thus regained the title as the largest and most powerful operating steam locomotive in the world. 4014, was re-acquired by Union Pacific, and between 20 it was rebuilt to operating condition for the 150th anniversary of the first transcontinental railroad. ![]() Today, eight Big Boys survive, with most on static display at museums across the USA. 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 Range 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.
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