The GE U50C was requested only by Union Pacific and
slightly different from the U50 in that it was meant for use in
high-speed freight service instead of heavy drag assignments. The model still came equipped with two FDL model prime movers that combined could produce 5,000 horsepower. However, with less need for extreme pulling power the engines were of the 12-cylinder variety, not sixteen which were used on the U50. While the engines
employed in the locomotive were essentially those used in the U25C, cataloged in
1963, the model's radiator design was more similar to the U33B/C due to
the shorter length (making them much larger and more rectangular). The shorter length not only allowed the locomotive to be much lighter but it also featured a C-C truck
setup instead of four, B-B trucks employed on the U50 which further
reducing its weight.
General Electric's Fleet Of "U-Boats"
The U18B, "Baby Boat"
The First Production Model U-Boat, The U25B
Following Up Its Predecessor, The U28B
The 3,000 Horsepower, U30B
The Fourth U-Boat Entrant, The Lukewarm U33B
The Most Powerful Four-Axle U-Boat, The U36B
A Late-Era Six-Axle U-Boat, The U23C
GE's First Six-Axle Design, The U25C
The More Powerful But Unpopular U28C
Building Success, The U30C
Another Popular Six-Axle Model, The U33C
GE's Final Standard Model U-Boat, The U36C
The Experimental, 5,000 Horsepower Behemoth U50
While the U50 weighed in at 557,000 pounds (or 278 1/2 tons) the U50C weighed just 442,660 (or 221 1/3 tons). Even though this provided for reduced wear on the track structure the model was still plagued with numerous reliability problems due to several design flaws, particularly in the electrical system which caught fire several times. As it turned out the trucks were still not sufficient to handle the locomotive's weight, as cracks were later found. As it turned out, virtually every problem imaginable was happening with the U50Cs in service. Aside from the issues mentioned above the locomotives suffered from dynamic brake issues, oil pressure problems, and leaking water coolant. Despite all of these problems UP would eventually roster a fleet of 40 U50Cs, numbered 5000-5039 by the time General Electric had completed production in November of 1971.
At the time,
GE was still fine tuning the development of its Universal series and
models being released through the 1960s were regularly plagued with
similar mechanical issues. However, the company's late model U-boats like the U30C, U33C, and U36C
were much were reliable and carried many of the same components as its
later "Dash 7" line. Still, at the time of the U50C's development EMD
was simply a better locomotive builder not only due to the past successes of models like the GP38, GP35, GP30, GP9, GP7 and its entire cab series but also thanks to the powerful DDA40X "Centennial" model developed between 1968 and 1969.
While the locomotive (which followed up the earlier DD35A that also successful but nearly to the extent of its later counterpart) was an experimental design built solely for UP, and constructed at the same time as the U50C, it was so reliable
that much of the fleet remained in service through the 1980s. Today,
#6936 is still operational as part of UP's Heritage Fleet. In any event, because of the severe reliability issues the
railroad had with the U50C all 40 were retired, sold, or scrapped by
1978 after less than ten years of service. Lastly, for more information about the locomotive and all of the builder's U-boat models please refer to the chart below.
GE U50C Production Roster
For more reading about GE's U-boat line the book U-Boats: General Electric's Diesel Locomotive by author Greg McDonnell provides a complete history of the company's first production diesel models. Also, noted historian Brian Solomon has authored a number of books covering the history and background of GE's locomotives. Two, which provide for a general but thorough coverage include GE Locomotives and GE And EMD Locomotives: The Illustrated History. As with virtually all of Mr. Solomon's you can expect a well-written title with large, crisp, and sharp photographs.