Full power current draw

A question for the trainmen here:

Watching the Horseshoe Curve webcam the other day, I got to wondering what is happening when diesel motive power has the engine running at full power but actual train speed is quite slow climbing the grade. How does the engine/generator and its traction motors handle the great amount of current being sent to the motors without burning up because they're turning so slowly?

I imagine its a function of motor design to cope with high current even when it's RPM is low?

I am John Galt !

Chris

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