Union Pacific (U.P.) No. 4014, is a four-cylinder articulated 4-8-8-4 Big Boy-class steam locomotive owned and operated by the Union Pacific Railroad. Built in 1941 by American Locomotive Company (ALCO), the locomotive is the only operating Big Boy of the eight that remain in existence. The locomotive operated in revenue service until 1959. It was donated to the Railway and Locomotive Historical Society in late 1961 and thereafter displayed in Fairplex in Pomona, California. In 2013, Union Pacific re-acquired the locomotive and launched a restoration at their Steam Shop in Cheyenne, Wyoming. On May 1, 2019, No. 4014 ran under its own power for the first time in over fifty-nine years, becoming the largest operational steam locomotive in the world. It now operates in excursion service.
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