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A high horsepower EMD does not have a roots blower. It has a turbo that is gear driven at low RPMs when there isn't nuch gas pressure. When the engine RPMs get higher and the exhaust pressure is higher the gear drive disengages and the turbo runs on gas pressure. This allows the EMD turbo to supply lots of air at all engine RPM ranges and I feel allows quicker buildup of power. I would expect the EMD turbo would have more failures because it is a more complicated machine. In fact I have had a number of EMD turbo failures and I cannot remember ever having a GE turbo fail. Then again I operated more EMDs than GEs. Also the number of failures I have seen over 28 years wasn't that high.
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