See now I have even more questions. Are these things direct coupled? I'm guessing alternators, but probably back in the early days, DC correct? So are they using VFD's for the motors? and how do they excite the generators? PMG or? Diesels are usually fairly low rpm. So are they using a gearbox and 2 pole or direct and say a 4 pole generator? Or are they using something other than 60hz?