Designed to haul 3,600-short-ton (3,214-long-ton 3,266 t) freight trains over Utah's Wasatch Range, No. 4014 was part of the first group of 20 Big Boys, classified as 4884-1. 4014 in November 1941 and delivered it the following month to Union Pacific, where it was placed in revenue service. 4014 on static display at the RailGiants Train Museum in Pomona, California, in 2005ĪLCO built No. History Revenue service and retirement (1941–1959) It is longer than two city buses and weighs more than a Boeing 747. Peak horsepower was reached around 35 mph (56 km/h) optimal tractive effort was reached around 10 mph (16 km/h).
It was designed for stability at 80 miles per hour (130 km/h), allowing for a wide margin of reliability and safety, as steam locomotives normally operated well below that speed in freight service. The Big Boy was articulated like the Mallet locomotive design, although without compounding. UP determined that its goals for the new class could be achieved by making several changes to the existing 4-6-6-4 Challenger design by enlarging the firebox to about 235 by 96 inches (5.97 m × 2.44 m) (about 155 sq ft or 14.4 m 2), lengthening the boiler, adding four driving wheels and reducing the diameter of the driving wheels from 69 to 68 in (1,753 to 1,727 mm). The Big Boy class was developed by Union Pacific (UP) and the American Locomotive Company (ALCO) to handle the 1.14% eastbound ruling grade of the Wasatch Range. Main article: Union Pacific Big Boy § Design Now part of the Union Pacific's heritage fleet, it now operates in excursion service, in addition to hauling revenue freight during ferry moves. It ran its first excursion, doubleheaded with Union Pacific 844, three days later on May 4, 2019. 4014 was operated for the first time after sitting dormant for almost six decades. In 2013, UP re-acquired the locomotive and launched a restoration project at their Steam Shop in Cheyenne, Wyoming. The locomotive operated in revenue service until 1959, when it was donated to the Railway and Locomotive Historical Society in late 1961 and thereafter displayed in Fairplex at the RailGiants Train Museum in Pomona, California. 4014 is the only operating Big Boy of the eight that remain in existence. It is a four-cylinder simple articulated 4-8-8-4 " Big Boy" type built in 1941 by the American Locomotive Company (ALCO) of Schenectady, New York. Union Pacific 4014, also known as the " Big Boy", is a steam locomotive owned and operated by the Union Pacific (UP) as part of their heritage fleet.
Operational, based at the Union Pacific steam shop in Cheyenne, Wyoming
Union Pacific ( Union Pacific Heritage Fleet)
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