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The Union Pacific's Overland Route, the eastern portion of the Transcontinental Railroad, was built west from Omaha, across Nebraska and Wyoming, and on into Utah.
Despite the influx of diesel locomotives following WWII, the Big Boys and Challengers remained the prime power on the Overland Route.
The Genesis 4-8-8-4 Big Boy includes a history book and instruction book for quick reference. Dieser Artikel wird A?ber das Programm zum weltweiten Versand verschickt und mit einer internationalen Sendungsnummer versehen.
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The steepest grade was the eastbound climb on the Echo Canyon line through the Wahsatch Mountains just east of Ogden, Utah. They were coal burners with 68-inch drivers, 135,375 pounds of tractive effort and 6,000 horsepower.
Wenn Sie auf Gebot bestA¤tigen klicken und HA¶chstbietender sind, gehen Sie einen rechtsverbindlichen Vertrag mit dem VerkA¤ufer ein. Forty 4-6-6-4 Challenger locomotives were acquired in 1936 and 1937 to move fast freight over the grades in Utah and Wyoming.
They started service on the line from Ogden to Green River, Wyoming and their operating range soon increased to cover the line all the way to Cheyenne. They were rated at 4,290 tons across Wyoming, but were limited to 3,100 tons eastbound through Echo Canyon. Traffic during WWII resulted in 5 more Big Boys, numbered 4020 through 4024, being built in 1944.


Union Pacific wanted something that could make the same speeds as the Challengers but could carry the entire 4,290-ton train over the Wahsatch Mountains without a helper. These versions were slightly heavier than the original order due to wartime materials restrictions. The easiest solution was to scale up the successful Challenger design by adding another pair of drivers to each half of the locomotive thus making a 4-8-8-4. In 1941 UP placed an order for twenty 4-8-8-4's, numbered 4000 through 4019, with the American Locomotive Works.
According to legend an unidentified machinist at the ALCO plant is responsible for the name "Big Boy", having scrawled the name in chalk on a partially completed locomotive.



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