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Hi <br />I guess the difference is in the auxiliaries; you see, that German PS rating was higher than US HP rating. I know a lot more about SD40-2s than BR1XX electrics, but I suppose as they are electric locomotives they get power for their auxiliaries direct from the overhead, thus the tractive PS rating is the combined power of all traction motors, no power loss for compressors etc. Remember, there are no generators/alternators in those beasts. And yes, the DIN and SAE horsepower factors are different, too.
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