The EMD DDA40X is a 6,600 hp (4,943 kW) D-D locomotive, built by EMD from 1969 to 1971 exclusively for the Union Pacific Railroad. [1] It is the most powerful diesel–electric locomotive model ever built on a single frame, having two 16-645E3A diesel prime movers. [2]

Dec 16, 2024 · The DDA40X was an experimental, high-horsepower diesel locomotive designed by Electro-Motive for Union Pacific during the late 1960s. It received its classic nickname as the "Centennial" to commemorate the 100th anniversary of the completion of the Transcontinental Railroad at Promontory Point, Utah.

Union Pacific 6936 is an EMD DDA40X locomotive built for the Union Pacific Railroad (UP). Previously a part of UP's heritage fleet, 6936 was for several decades the last remaining operational "Centennial" type, and thus the largest operational diesel-electric locomotive in …

The Electro Motive Division DDA40X (nicknamed "Centennial") is a 6,600 hp, twin-engine (consisting of two modified 3,300 hp 16-645E3A engines), eight-axle diesel locomotive built specially for the Union Pacific Railroad (UP) from 1969 to 1971.

Jan 15, 2003 · Weighing in at 270 tons, the DDA40X was labeled as 'The World's Largest and Most powerful Diesel Electric Locomotive'." All of the Centennial units were equipped to operate at 90 miles per hour, using EMD's standard high speed 59:18 gear ratio.

May 5, 2022 · EMD DDA40X: In 1968, Union Pacific purchased 50 20-cylinder, 3,600 hp EMD SD45s for high-speed service. However, the units did not meet management’s expectations in that role. So, UP commissioned EMD to design and build a locomotive that would develop more horsepower than the DD35, U50, or C855 models.

Actually comprising two engines on one frame, they delivered 6,600 horsepower. Designed and built exclusively for Union Pacific Railroad, the units were named in honor of the railroad's centennial anniversary celebration in 1969. Accordingly, they were numbered in the 6900 series, from 6900 to 6946.

The EMD DDA40X is a 6,600 hp (4,943 kW) D-D locomotive, built by EMD from 1969 to 1971 exclusively for the Union Pacific Railroad. It is the most powerful diesel-electric locomotive model ever built on a single frame, having two 16-645E3A diesel prime movers.

EMD DDA40X "Centennial" Data Sheet Information Compiled by: JEAN-DENIS BACHAND: New: 26 June 2006 : Artwork by: Jean-Denis Bachand-Engine Builder: EMD: Engine: Two 645E3A 16 cylinder: Bore & Stroke: 8.5" X 10" RPM (Maximum / Minimum) 800 / 275 : Main Generator: Two GM - AR12: Horsepower: 6600:

3 days ago · EMD went back to the drawing board, and came up with a new version of the double GP35, powered by pair of GM 645 diesel engines. The 645 had a huge 645 cubic inches of displacement per cylinder. This new locomotive was designated a DDA40X.