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I’m a stickler for detail and some times it makes a difference. The official designation is GP15-1. That signifies that the locomotive did not have the Dash 2 electrical components. The GP15-1 was intended to be a factory option to compete with rebuilds of GP7 and GP9 units. Consequently, they did not use all state of the art components. There is a difference between a GP38 and a GP38-2. The Dash 2 line was an improvement of certain systems on the locomotive, mainly electrical, and was applicable to all models in production at the time it was implemented (1972 ?). The vast majority of MP 2000 hp EMD units were Dash 2s.
