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Union Pacific's Big EMDs
DD35 and DDA40X
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After testing EMDsGP35-DD35-DD35-GP35 demonstrator set, Union Pacific was so pleased with thedesign that it almost immediately ordered an additional 25 DD35s and 22matching GP35s, which were delivered between May and August 1964. These joinedthe four-unit demonstrator set previously acquired by the carrier.
As with UP's earlier experienceswith cabless booster units, the lack of flexibility of these massive,mainline-only units soon became apparent, and a planned follow-on order for 15units was changed from booster units to 15 units with fully equipped cabs theDDA35 was born.
The Centennials were the finalexample of Union Pacific's search for the ideal locomotive. While the roadpursued a study of its motive power needs in late 1967 and early 1968, UP inMarch 1968 tried, as a stopgap measure, using EMDs SD45 model as ahigh-horsepower, high-speed locomotive, but with limited success. UP returnedto the concept of double-engine locomotives and in collaboration between therailroad and EMD, the DDA40X came to life. Within 13 months of an initial March 1968 communication, the railroad and thebuilder had worked out a definitive design, and the first unit was delivered.The timing of the first unit coincided with the 100th anniversary of the May10, 1869, ceremony marking the driving of the Golden Spike at PromontorySummit, Utah and the DDA40X quickly became known as the Centennial. It wasnumbered 6900, and 46 more examples arrived over the next 28 months.
Contents:
DDA35 and DD35, pp. 5-32;
DDA40X, pp. 33-66;
UP6936 The Survivor, pg. 67;
DDA35 and DD35 Roster, pg. 68;
DDA35 and DD35 Detail Views, pp. 69-73;
DDA40X Roster, pg. 74;
DDA40X Detail Views, pp. 75-78;
DDA35 and DD35 Diagrams, pg. 79;
DDA40X Diagram, pg. 80;
DDA35 and DD35 in Color, p. 81-108;
DDA40X in Color, pp. 109-141;
Additional Reading, pp. 142-143. Softbound, 8.5x11, 144 pages, 300+b&w and color photos, diagrams.Visit our store to view other books of interest.We add new books regularly so check back often.
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