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| Last updated on August 7, 2025
General Electric 2504 was one of four red-and-white U25B demonstrator diesels that toured the nation in 1962. One, No. 2501, was the first U25B with a low nose; the others had the high nose that was just then falling from favor. Nos. 2501–2504 went to Union Pacific after their tour.
Photo by J. David Ingles
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Remember that General Electric had long been touted as a company that supplied parts for other manufacturers. That would all change with GE’s entry into a road-switcher market dominated by EMD and Alco. In the late 1950s, GE’s engineers were developing a new V16 engine. What followed was the creation of the U25B road switcher. Available in both high-nose and low-nose variants, GE would sell over 450 U25Bs to a variety of Class I railroads. The U25B would pave the way for future Universal series locomotives.
Dr. Güntürk Üstün