UP worked with ALCO to design and created the 4-8-8-4 Big Boy in the early 1940s to run on trains between Green River, WY and Ogden, UT without having to "double head" (run two steam engines instead of one) the trains. 25 Big Boys were built and delivered between 1941 and 1944 and they ran in service until 1959. After starting between Green River, WY and Ogden, UT, they were later moved to Cheyenne and ran on trains primarily between Cheyenne, WY and Laramie, WY over Sherman Hill. 60 years after leaving service, UP 4014 steams again as it departs west with a special to head toward Sherman Hill.
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