> When did they deliver AC at 25 cycles? I do recall some 50 cycle
>> companies around that had to change after the end of WWII.
> I don't know when the last 25-cycle power was phased out. Keokuk, Iowa,
> had a 25-cycle hydroelectric plant -- driven by the Mississippi River,
Doesn't Amtrak still have some 25 Hz power plants from its predecessor lines in the Northeast Corridor? Some locations have been converted to commercial power, some of them still owned and operated by Amtrak still provide 25 Hz.
Their electric locomovies are designed to run on either frequency and within a certain range of voltages (24,000 and higher) to accomodate the variations in the power supplied by commerical power in different sections and also those sections served by their legacy power plants.
Wes Leatherock snipped-for-privacy@aol.com snipped-for-privacy@yahoo.com