| Last updated on August 8, 2025
Union Pacific’s infatuation with super-sized diesels led to the creation of the General Electric U50 in 1963. The units featured two 2,500 h.p. engines on B+B-B+B running gear – essentially two U25Bs under one roof. UP bought 13 of the brutes; SP, 3.
Photo by General Electric
Members enjoy 15% off any purchase in our store. Join Today!
All of the Union Pacific “U-Boats” and Southern Pacific “Baby Hueys” were sold for scrap by 1977.
Dr. Güntürk Üstün