SS President Coolidge Newport News, Virginia built the two ships, completing "President Hoover" in 1930. The keel for "President Coolidge" was laid 22 April 1930 and the ship was delivered 1 October 1931. They were the largest merchant ships built in the United States up to that time. 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
John Calvin Coolidge Sr. of the peace and a notary public, administered the presidential oath of office to his son at the Coolidge Homestead in Plymouth Notch, Vermont, at about 2:30 a.m. on August 3, 1923. John Calvin Coolidge Sr. died in Plymouth, Vermont on . He was buried at Plymouth Notch Cemetery. In 1868, Coolidge married Victoria Josephine Moor (b. 1850). They were the parents of two children, son Calvin, and daughter Abigail (1875-1890). Victoria Coolidge died in 1885, at the age of 35. Coolidge married again on September 9, 1891. to Caroline Athelia Brown (1857–1920). John Calvin Coolidge Sr. John Calvin Coolidge