January 24, 2024
Union Pacific's Big EMDs-DD35 and DDA40X Railroad Book
Pricing & History
-
Sold for
Start Free Trial or Sign In to see what it's worth.
- Sold Date
- Source eBay
Union Pacific's Big EMDs - DD35 and DDA40X After testing EMD's GP35-DD35-DD35-GP35 demonstrator set, Union Pacific was so pleased with the design that it almost immediately ordered an additional 25 DD35s and 22 matching GP35s, which were delivered between May and August 1964. These joined the four-unit demonstrator set previously acquired by the carrier.As with UP's earlier experiences with cabless booster units, the lack of flexibility of these massive, mainline-only units soon became apparent, and a planned follow-on order for 15 units was changed from booster units to 15 units with fully equipped cabs the DDA35 was born.The Centennials were the final example of Union Pacific's search for the ideal locomotive. While the road pursued a study of its motive power needs in late 1967 and early 1968, UP in March 1968 tried, as a stopgap measure, using EMD?s SD45 model as a high-horsepower, high-speed locomotive, but with limited success. UP returned to the concept of double-engine locomotives and in collaboration between the railroad and EMD, the DDA40X came to life. Within 13 months of an initial March 1968 communication, the railroad and the builder 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 May 10, 1869, ceremony marking the driving
read more
Items in the Price Guide are obtained exclusively from licensors and partners solely for our members’ research needs.
If this item contains incorrect or inappropriate information please contact us here to flag it for review.
If you are the originator/copyright holder of this photo/item and would prefer it be excluded from our community, contact us here for removal.
If you are the originator/copyright holder of this photo/item and would prefer it be excluded from our community, contact us here for removal.
