The most common variety of the T-2 style tanker was the United States Maritime Commission type T2-SE-A1, a commercial design already being built by Sun Shipbuilding Company for Standard Oil Company of New Jersey. There were 481 of these built between 1942 and 1945. Propulsion was provided by a turbo-electric drive. This consisted of a steam turbine generator connected to a propulsion motor to turn the propeller, thus obviating the need for a large main reduction gear, which would have taken quite a lot of time and machinery to produce, machinery that was already busy making these gear sets for naval vessels. These ships were built by Alabama Drydock &, Shipbuilding Company of Mobile, Alabama, the Kaiser Company's Swan Island Yard at Portland, Oregon, the Marinship Corporation at Sausalito, California and the Sun Shipbuilding &, Drydock Company of Chester, Pennsylvania in extremely short production times. The average production time from laying of the keel to completion for sea trials was about 70 days, including 55 in the building ways and another 15 in the fitting out dock. The record was held by Marinship Corporation, completing S.S. Huntington Hills in just 33 days, 28 days on the way and 5 days of fitting out!