The Union Pacific Big Boy is a class of large articulated steam locomotives built for Union Pacific Railroad beginning in 1941, designed to haul heavy freight over the mountain grades of Wyoming and Utah. At roughly 132 feet long and over a million pounds, the class ranks among the largest and most powerful steam locomotives ever built, and one preserved example, No. 4014, has operated in excursion service after restoration.
Facts
SignificanceThe largest and most powerful steam locomotive ever built, designed to haul heavy freight over mountainous terrain without helper locomotives. 1 Manufacturer or BuilderAmerican Locomotive Company (ALCO) 1 Connections
Sources
1. Wikipedia: Union Pacific Big Boy
WikipediaDesign sectionQuote, Design section
The 25 Big Boy locomotives were built to haul freight over the Wasatch Range between Ogden, Utah, and Green River, Wyoming.
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