In May and June of 1959, GE released its initial two U25B demonstrators, #751-752. At the time these locomotives were referred to as the "XP24" which stood for: Export Test Unit, 2400 Horsepower

GE Demo XP24-1 (U25B test bed) #751 & 752, Mechanicville NY 1960, blt 1939 cn33505, Joseph Testagrose: GE U25B demo #2502, Omaha NE. 1962, blt 1962 cn34234, ex UP 633, to MK 1: PRR U25C #6506, Broadway, Cleveland OH, blt 1965 cn35052 George Elwood: PRR U25C #6509, Broadway, Cleveland OH, blt 1965 cn35055

**Total includes four XP24 proto-types Source of information: Extra 2200 South. Corrections / additions provided by: John Whittingham. Batch/Order numbers were provided by Dave Dallner.

Numbered 751 and 752, these new locomotives were designated as model XP24, or Export Test Units 2400 horsepower. As was the custom at GE, these two engines were handed off to the Erie Railroad for testing.

While each unit was powered by a 12-cylinder power plant, GE had begun development of a 16-cylinder engine that would first appear in 1959 in a pair of 2,400-horsepower demonstrators designated as model XP24.

4 days ago · There is little discussion of these historical GE Universal Series Locomotives. By my count there were roughly 400 Universal Series locomotives built by GE before the XP24 was announced as the U25B. How much experience did GE …

What was originally known as the XP24, the two high-hood U25B testbeds eventually progressed the Universal line further into domestic production equipped with their revolutionary turbocharged GE 7FDL-16 prime-movers capable of providing 2,500hp: something previously not accomplished by rival EMD, but rather with their six-axle, 2,400hp SD24 ...

These XP24s racked up more than 100,000 miles of rigorous running, and were returned to the factory for modifications. In 1960 these two XP24s re-emerged from GE’s plant in a new paint job – blue and off-white – a higher horsepower rating – …

Mar 19, 2025 · Did the experimental XP24 early U25B that was in GE's back lot a few years ago get preserved? <p>It seems like the GE units have been overlooked in presevation, while everyone seems to be acquiring old Geeps, Alcos and SDs. <br>

Oct 4, 2008 · A photo has appeared of what looks like a 6 cylinder, 2,300hp version of GE’s GEVO. http://www.rrpicturearchives.net/showPicture.aspx?id=1324365. From reading the description, it looks like GE intends for this engine to be …