Railroads & Locomotives Locomotives Locomotive profile: DDA40X

Locomotive profile: DDA40X

By Angela Cotey | March 16, 2020

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Original DDA40X is on display in Omaha, Nebraska.
Original DDA40X is on display in Omaha, Nebraska.
Jim Wrinn

•YEARS BUILT: 1969-1971


•OPERATED ON: Union Pacific (special order from UP)

•NAME: Centennial, named to mark the 100th anniversary of the Golden Spike ceremony at Promontory Summit, Utah.



•KNOWN FOR: The most successful of UP’s twin-engine freight diesels of the 1960s.

•STATUS: Several preserved around the country, and one, No. 6936, operates occasionally as part of UP’s heritage program

5 thoughts on “Locomotive profile: DDA40X

  1. I was there in Salt Lake City when the 6900 came in with the Golden Spike train from back east. Also rode in the 22 car train behind then 8444 at 90 MPH from Salt Lake to Ogden.

  2. Where is 6936 stored and is there any schedule for it to be running over UP tracks in the near future.

  3. They really should include a downloadable / printable scale detail drawing of the locomotives with these profiles. As well, they should include information regarding the different modifications to the product over its life time.
    . . . You know, the sort of information that would interest regular (12″ to 1′ scale), scale (7-1/2″ & O gauge), and model railroaders (OO, HO, N, & Z)

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