Locomotive # 4455

Golden, CO - Union Pacific Class S-6 0-6-0 Switcher Locomotive # 4455 was built by Lima in 1920. It was sold to Monolith Portland Midwest Company, Laramie, WY, in 1949. Monolith Portland retired #4455 in 1970 and donated it to the museum. Weighing 159,000 lbs, with 21" x 26" cylinders and 51" drivers, the locomotive operated at a boiler pressure of 180 psi delivering 34,400 lbs tractive effort. The 0-6-0 dominated switching duties in US railroads up to WWI, although heavier freight loads had brought more orders for 0-8-0s. At the same time, old road engines were often diverted to switching, either as-built or after their leading and trailing trucks were removed. After WWI, the success of the USRA 0-8-0 design reduced demand for 0-6-0s. Although orders did continue right into the 1940s, they were generally used on lighter duties and in smaller yards.

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