This four-cylinder articulated 4-8-8-4 Big Boy-type steam locomotive was built in November 1941 and was retired on July 21, 1959.
Vehicle - Trains, Trolleys and Streetcars
It was donated to the Railway & Locomotive Historical Society in 1961. In 2013, Union Pacific reacquired the locomotive with plans to restore it to operational condition. Once it returns to service, it will become the world's largest operational steam locomotive.