Union Pacific 6900 Series Centennials DDA40X 6600hp. (6900-6946) built between 4/69 - 9/71. Equipped with two 16-645E3A Diesel Engines, Fuel tank 8200 Gals, (2) 4-axle "D" truck assemb... (more)
An eastbound Union Pacific engineering special approaches Tunnel 1 at Plainview, Colorado, on the afternoon of August 13, 2003. The 11-car passenger train is powered by impressive EMD DDA40X “Cent... (more)
Four Union Pacific DDA40X Centennials stored with GP30B's/SD24A's and B's at UP's Yermo Yard, near Barstow, California.
UP 6938 was retired on May 25, 1985 and was cosmetically restored to be put on display in front of the Jenks Shops where it still sits today.
The Centennials were the largest diesel electric locomotives ever built comprising of two engines on one frame they delivered 6,600 horsepower and were only designed and built for the Union Pacifi... (more)
Union Pacific EMD DDA40X No. 6938 sits on display in front of the railroad’s Downing B. Jenks Shop at North Little Rock, Arkansas, on May 8, 2014.
Two UP DDA40X "Centennials" 6922 and 6929 at Council, Bluffs, Iowa in August 1980.
Union Pacific EMD DDA40X “Centennial” No. 6936 powers a westbound engineering passenger special curving through Pinecliffe, Colorado, on October 4, 2001.
EMD DDA40X No. 6923 leads a westbound freight out of Cheyenne, Wyoming, in April 1984. Trailing the big “Centennial” is a pair of SD40-2s, and a large cut of stock cars behind the power.
A westbound Union Pacific train changes crews in front of the depot at Cheyenne, Wyoming, in April 1984. The train is led by an imposing UP DDA40X No. 6935. Delivered by EMD in 1969-71, UP Nos. 69... (more)
Union Pacific EMD DDA40X “Centennial” No. 6936 is serviced at UP’s North Yard at Denver, Colorado, on October 3, 2001. The unique locomotive will be powering an inspection train on the former Rio ... (more)
A Roger Puta Photograph
"Big Jacks" Heading for Cajon ... And RetirementOn a bright April 1980 day, an eastbound Union Pacific freight climbs out of San Bernardino as it approaches the steep grades of Cajo... (more)
Union Pacific’s EMD DDA40X “Centennial” No. 6936 powers a westbound engineering special at Crescent, Colorado, on October 4, 2001.
A westbound Union Pacific van train departs North Platte Yard at Birdwood, Nebraska, on July 11, 1984. Leading the train is EMD DDA40X “Centennial” No. 6912 paired up with a SD40-2.