EMD DDA40X

Uncommon card · No. 180122

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. It is the most powerful diesel–electric locomotive model ever built on a single frame, having two 16-645E3A diesel prime movers. Union Pacific has marked DD40X on the cab exteriors, while EMD literature inconsistently refers to this model as either DD-40X or DDA40X. UP's DDA40X locomotives were the culmination of the company's experiments with extremely powerful locomotives that began with its gas turbine–electric locomotives and DD35s. For manufacturer EMD, the construction of the world's most powerful single frame locomotive was a sign of the company's dominance of the North American diesel locomotive market, with only GE Transportation an equal competitor. The DDA40X also pioneered a number of new technologies that would go on to be incorporated in future EMD designs. UP did not continue with exceptionally powerful locomotives like the DDA40X built on single...

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