 Each ship had turbo-electric transmission, with a pair of steam turbo generators generating current that powered propulsion motors on the propeller shafts.Westinghouse built the turbo generators and propulsion motors for "President Coolidge" but General Electric built the turbo generators and propulsion motors for "President Hoover".In the "President Coolidge" twelve Babcock & Wilcox superheater type water tube boilers provided steam for main and auxiliary power.