The Union Pacific Steam Turbine Locomotive 833, an FEF-2 class steam locomotive which was constructed by the American Locomotive Company (ALCO) in 1939. The 833 weighs in at a substantial 454 tonnes, engine and tender, and measures an impressive 113 foot, 10 1/8 inches long, with 80 inch diameter drivers.

more info see: http://theunionstation.org/museums-2/utah-state-railroad-museum/