A cargo liner is a type of merchant ship which carries general cargo and often passengers. They became common just after the middle of the 19th century, and eventually gave way to container ships and other more specialized carriers in the latter half of the 20th century.
A cargo liner has been defined as:
A vessel which operated a regular scheduled service on a fixed route between designated ports and carries many consignments of different commodities.
Cargo liners transported general freight, from raw materials to manufacturers to merchandise. Many had cargo holds adapted to particular services, with refrigerator space for frozen meats or chilled fruit, tanks for liquid cargos such as plant oils, and lockers for valuables. Cargo liners typically carried passengers as well, usually in a single class. They differed from ocean liners which focussed on the passenger trade, and from tramp steamers which did not operate on regular schedules. Cargo liners sailed from port to port along routes and on schedules published in advance.
The cargo liner developed in the mid-19th century with the advancement of technology allowing bigger steamships to be built. As cargo liners were generally faster than cargo ships, they were used for the transport of perishable and high-value goods, as well as providing a passenger service. At first, they were used in Europe and between Europe and America. Longer routes, such as that to Australia, remained in the hands of sailing ships, due to the inefficiency of the steamship of the time.
The use and increased reliability of the compound steam engine gave greater fuel efficiency and opened these routes up to steamships. Alfred Holt pioneered the use of these engines in his steamships. It was now possible for a steamship to carry enough coal to travel 6,000 miles (9,700 km) before needing to refuel. The opening of the Suez Canal in 1869 and the Panama Canal in 1914 also made the use of cargo liners more profitable, and made possible regular scheduled overseas services. Cargo liners soon comprised "the great portion of the British merchant fleet", the largest in the world.
- Craig, Robin (1980), "Steam Tramps and Cargo Liners, 1850-1950", The Ship (London: National Maritime Museum/W.S.Cowell Ltd. for Her Majesty’s Stationery Office) 5, ISBN 0-11-290315-0
- Woodman, Richard (2002), The History of the Ship, London: Lyons Press (Globe Pequot Press)/Conway Maritime Press, ISBN 1-58574-621-5.
- Greenway, Lord Ambrose (2009). The Cargo Liners, an illustrated history. Seaforth Publishing. ISBN 978-1-84832-006-2.