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 Coolidge John Coolidge John Calvin Coolidge III (September 7, 1906 – May 31, 2000) was an American executive, businessman, and entrepreneur with the New York, New Haven and Hartford Railroad, and the first son of President Calvin Coolidge and Grace Coolidge. John Coolidge was born in Northampton, Hampshire County, Massachusetts, on September 7, 1906. He was the elder of the two children of Calvin Coolidge (1872–1933), the 30th President of the United States from 1923 to 1929 and Grace Anna Goodhue (1879–1957), First Lady of the United States from 1923 to 1929. In his autobiography, Calvin Coolidge recorded his impressions of