The GP15D is a four-axle B-B switcher built by MotivePower and Electro-Motive Diesel.

It was supplied with a Caterpillar 3512 (called a 12-170B15-T2 by EMD) V12 prime mover which develops a total power output of 1,500 horsepower (1,120 kW).

The changes between the MP1500D and the GP15D are primarily in the control electronics, making them easier to use than the older model.

The GP15D is also similar in appearance to the contemporaneous GP20D, except that the 20 GP15D units produced to date do not have dynamic brakes and have a lower horsepower rating (1500 vs 2000).

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