The EMD DDA40X was a 6600 hp (4.92 MW) D-D diesel-electric locomotive built by the General Motors EMD division of La Grange Illinois for the Union Pacific Railroad. Nicknamed Centennial and Big Jack the DDA40X uses two diesel engines (each providing 3300 hp (2.46 MW)) and remains the most powerful single-unit diesel locomotive type ever built although more recent locomotive designs such as the GE AC6000CW EMD SD90MAC and the China Railway DF8C have come close.
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