The SS Megantic was a British transatlantic ocean liner launched in 1908, built by Harland and Wolff in Belfast. She was one of two sister ships originally ordered by Dominion Line in 1907 but completed for White Star Line after transfer of ownership. Megantic was constructed on slipway number seven of Harland and Wolff's South Yard and was completed on 3 June 1909. She measured nearly 15,000 GRT, making her one of the largest ships on the Liverpool–Canada route at the time. Her design featured a conventional twin screw propeller system powered by quadruple-expansion steam engines, producing approximately 1,180 NHP and enabling her to reach speeds of around 17 knots. Her passenger accommodations included 230 first-class, 430 second-class, and 1,000 third-class berths, reflecting her role as a passenger liner. Initially, Megantic served on the Liverpool–Quebec City route, operating alongside her sister Laurentic, and was part of a White Star Line fleet that included other ships such as the Canada and Dominion. She embarked on her maiden voyage on 17 June 1909. Notable early service included the 1910 transfer of the murder suspect Hawley Harvey Crippen from Rimouski to Britain. The vessel was equipped with wireless telegraphy by 1911, operating on 300 and 600 meters, with a notable transmission range of 2,500 miles across the Atlantic. During World War I, she briefly operated between Liverpool and New York before being requisitioned on 6 April 1917 as a troop ship, transporting Canadian and American forces. She participated in military service until after the war, when she was refitted in 1919 and her passenger capacity was increased. Throughout the 1920s, Megantic alternated between liner service and cruises, including voyages to the West Indies and the Caribbean. She was also chartered as a troop ship for the Royal Marines in 1927. Her service ended after she was laid up in 1931, and she was sold for scrap in 1933 amid the collapse of White Star Line, arriving in Osaka in May for dismantling. Megantic's career highlights her significance as a large, versatile passenger and troop ship during the early 20th century, reflecting advances in maritime engineering and transatlantic travel.

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