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Dynamic braking
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==Self-load test== It is possible to use the brake grids as a form of [[dynamometer]] or [[load bank]] to perform a self-load test of the power output of a locomotive. With the locomotive stationary, the main generator (MG) output is connected to the grids instead of the traction motors. The grids are normally large enough to absorb the full engine power output, which is calculated from MG voltage and current output.
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