View of the ocean liner the Queen Elizabeth (of the Cunard line) as it sails into port, New York, New York, 1958. Visible in the background is the Chrysler Building (1930, William Van Alen) (at left), the Chanin Building (1929, Sloan & Robertson), and 500 Fifth Avenue (1931, Shreve, Lamb & Harmon) (right). (Photo by Andreas Feininger/Time & Life Pictures/Getty Images). The location of this image is New York, NY United States. Copyright: Time & Life Pictures

An ocean liner is a ship designed to transport people from one seaport to another along regular long-distance maritime routes according to a schedule. Liners may also carry cargo or mail, and may sometimes be used for other purposes (e.g., for pleasure cruises or as hospital ships ).
Cargo vessels running to a schedule are sometimes referred to as liners. The category does not include ferries or other vessels engaged in short-sea trading, nor dedicated cruise ships where the voyage itself, and not transportation, is the prime purpose of the trip. Nor does it include tramp steamers , even those equipped to handle limited numbers of passengers. Some shipping companies refer to themselves as "lines" and their container ships , which often operate over set routes according to established schedules, as "liners".
Ocean liners are usually strongly built with a high freeboard to withstand rough seas and adverse conditions encountered in the open ocean, having large capacities for fuel, food and other consumables on long voyages.

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