Rating
Electric locomotives usually have a continuous and a one-hour rating. The one-hour rating is typically about ten percent higher than the continuous rating, and limited by the temperature rise in the motor.
In diesel-electric and gas turbine-electric locomotives, the horsepower rating of the traction motors is usually around 81% that of the prime mover. This assumes that the electrical generator converts 90% of the engine's output into electrical energy and the traction motors convert 90% of this electrical energy back into mechanical energy. Calculation: 90% × 90% = 81%.
Individual traction motor ratings usually range up 1,600 kW (2,144 hp)
Read more about this topic: Traction Motor