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<P>Not large speed changes.  I think idel was around 500. top end was  900 for the alcos.  I don't know abouth the GM's.  All boats with VPP have some variance in engine rpm.  An engine running full speed lightly loaded isn't as fuel eficient.  They would raise rpm and pitch simotaniously.  For some reason they never used full auto mode but set rpm and pitch manually.  Aso, you wouldn't want it to idel at 900.  At 500 (asuming that's th idel for the GM's) you wouldn't have the exaust flow to turn the blower, so it's engine drivenat those speeds.  Trains (except for switching engines) and civilian ships would natually set a speed and hold it as much as posable to save fuel so you wouldn't constntly clutchand unclutch.</P> <P> </P>
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