Diesel "D" truck sideframes

The term "D" truck refers to a 4 axle truck where all axles are powered. These were used on high-horsepower units built by EMD for the Union Pacific when that railroad was experimenting with single, high-horsepower units. The GE U50 and Alco C855 were the contemporaries of the EMD DD35 and DD40 units. The EMD units were essentially 2 locomotives in a single body and on a single set of trucks.

The models and variants

EMD D truck



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