07/16/2026
The Biggest Boys
Union Pacific (UP) 4-8-8-4 "Big Boy" locomotives 4012 and 4014 are on display on adjacent tracks at Steamtown National Historic Site, as an extended stopover on the latter's historic tour of the eastern United States. The two locomotives, as well as 23 siblings, were built between 1941 and 1944 by the American Locomotive Company (ALCO), initially hauling freight over the Wasatch Range between Utah and Wyoming. The class was retired from service in 1959, being replaced by diesel-electric and gas turbine-electric locomotives, with some being stored in operational condition as late as 1962. Locomotive 4012 was donated to Steamtown, U.S.A. in 1962, later moving to Steamtown NHS along with the entity. It was cosmetically restored in 2021. Locomotive 4014 was retired from service in 1961 and donated to the Railway & Locomotive Historical Society in Pomona, CA, and was displayed at RailGiants Train Museum. In 2019, the locomotive operated under its own power for the first time in nearly six decades, following an intense rebuild by Union Pacific Heritage Fleet Operations forces. In 2026, the locomotive embarked on a coast-to-coast tour from California to Pennsylvania with numerous stops and events along the way. A multi-week stop at Steamtown NHS was part of this plan, which would be the first time two Big Boy locomotives had been reunited on adjacent tracks in over six and a half decades! Taken June 20, 2026.