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Amtrak and HEP
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Thanks for the reply, Alaskaman. Much appreciated. <br /> <br />I understand that a higher RPM is required to produce HEP. However, I am still curious to know why the RPM dropped so significantly after HEP was restored. I don't know the "normal" RPM an Amtrak locomotive idles at, but to give you an example, prior to the HEP being turned off, the RPM was let's say 5000. After the HEP was restored, the RPM was 2000. Why so much of a difference? Does HEP actually make a locomotive idle at a higher RPM on an as needed basis? Just by the audible difference, I was given the impression that the conductor had to "reset" something by shutting down the HEP. Can anyone elaborate on this?
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