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When the locomotive is in "standby" mode, the engine runs at 720 rpm (instead of 900). In this case, HEP power is drawn form the traction alternator (instead of the HEP alternator). The HEP generator needs 900 rpm to produce 60Hz, the traction alternator has more poles, so it just needs 720 for 60Hz. Anyway, in a locomotive consist, only one locomotive is needed to provide HEP power, others just run in "Freight mode" at variable engine speeds. The F59 has an independent HEP engine (a smaller CAT V12), so the prime mover works just like in a freight loco. fgr
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