The big news on the Union Pacific back in the Summer of 1984 was the reactivation of most of their Centennial fleet of DDA40X "double diesels". Near the very end of their short lived return to se... (more)

On May 8, 2014, Union Pacific EMD DDA40X No. 6938 sits on display in front of the railroad’s Downing B. Jenks Shop at North Little Rock, Arkansas.

UP DDA40X 6913 with SD40-2 3485 heading west near Granite, Wyoming. A Mike Bledsoe Photo.

UP EMD DDA40X 6927 with SD40-2 3197 near Hermosa Tunnel, Wyoming. A Mike Bledsoe Photo.

A westbound Union Pacific “van” train, led by EMD DDA40X “Centennial” No. 6917, approaches Dale Junction on a desolate spring day on Wyoming’s Sherman Hill in April 1984.

Westbound Union Pacific DDA40X 6929 leaving Cheyenne, Wyoming. A Mike Bledsoe Photo.

UP 6930 and the now gone CNW twins look on at IRM.

UP Centennial 6936.

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 assembly. Length... (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 “Ce... (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. No photographer listed on slide.