The SS Invicta was a notable passenger ferry constructed in 1939 by William Denny & Brothers of Dumbarton, with yard number 1344. Launched on December 14, 1939, and completed by June 1940, she measured 336 feet 5 inches (102.54 meters) in length, with a beam of 50 feet 1 inch (15.27 meters) and a depth of 24 feet 5 inches (7.44 meters). Her gross register tonnage was 4,178 GRT, and her net register tonnage was 1,982 NRT. The vessel had a draught of 12 feet 9 inches (3.89 meters). Powered by four Parsons turbines built by Denny's, Invicta's propulsion system drove twin screw propellers via single reduction gearing, producing a total of 11,000 shaft horsepower (8,200 kW). This power enabled her to reach a speed of 22 knots (41 km/h). Steam was supplied by two Yarrow water tube boilers, originally coal-fired, which were converted to oil in 1946. Her engines allowed her to serve efficiently on her designated route. Initially requisitioned by the Admiralty upon completion, Invicta was laid up on the River Clyde before being converted into a Landing Ship, Infantry during 1941 by Barclay, Curle & Co Ltd. She was capable of carrying six LCAs and 250 troops. She was commissioned as HMS Invicta on June 3, 1943, and participated in notable wartime operations, including the Dieppe Raid in August 1942 and the Normandy invasion on D-Day, June 6, 1944, where she transported members of the 7th Canadian Infantry Brigade to Juno Beach. During this operation, she carried war casualties, including Richard Pirrie, the first Australian killed on D-Day. After the war, Invicta was decommissioned in October 1945 and returned to civilian service. She was refitted, converted from coal to oil, and resumed her role on the Dover–Calais route, beginning peacetime crossings in October 1946. Throughout her service life, she underwent several refits, including the addition of stabilizers in 1947, and was featured in films such as *Golden Arrow* (1947) and *San Ferry Ann* (1966). Renamed and repainted in Sealink livery in 1967, Invicta was classified as a Class 99 locomotive under the TOPS system in 1968, with the number 99 010. She served until her final voyage in August 1972, after which she was laid up and eventually sold for scrap in 1972, ending her distinguished maritime service.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.