The EMD DDA40X is a 6,600 hp (4,922 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 …

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 …

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 …

Jul 1, 2025 · Centennial DD40X Union Pacific has retained only one of its 47 Centennial diesel-electric locomotives, No. 6936. The Centennials were the largest diesel-electric locomotives ever built. …

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 …

Nov 18, 2024 · These 47 locomotives were the longest diesel locomotives ever built, at 98 feet, 5 inches. Their frames were too long for EMD to manufacture and were fabricated by the John Mohr Company …

World’s largest diesel locomotive, Union Pacific DDA40X #6922, with side panels open showing detailed twin-engine layout. Each DDA40X stretched 98 feet long and tipped the scales at over 540,000 …

Based on the HP rating the DDA40X is the most powerful diesel locomotive ever built and coupled with the special introduction and the romance in the name "Centennial" it has become an icon for diesel …

Dec 8, 2025 · This new locomotive was designated a DDA40X. The D designation means a truck (set of wheels) with 4 axles, the A means a unit with a cab, the 40 was the next good sounding number …

Union Pacific’s DDA40X. The DDA40X locomotive was built solely for the Union Pacific railroad. Only 47 were build (6900-6946), and only 13 of them still survive today and one of those actually still …