SS Calgaric was a steam ocean liner that was completed in 1917, assumes service in 1918 and scrapped in 1934. She was built for the Pacific SN Co Line as Orca. In 1923 she was transferred to the Royal Mail Line. In 1927 she was transferred to White Star Line and renamed Calgaric. Orca was the third of three sister ships built for Pacific Steam. The first was , launched in 1913, and the second was , launched in 1914. Building Harland & Wolff built Orca at Belfast during the First World War. She was yard number 442, built on slipway number 7. She was launched on 5 April 1917 and delivered to Pacific Steam on 25 May 1918. Orca had the same dimensions and engines as Orduña and Orbita. Her registered length was , her beam was and her depth was . She also had the same propulsion system. She had three screws and a propulsion system called "combination machinery". Her port and starboard screws were each powered by a four-cylinder triple expansion engine. Exhaust steam from this pair of reciprocating engines drove a low-pressure turbine, which powered her middle screw. Between them the three engines developed a total of 11,900 ihp and gave Orca a speed of . Pacific Steam Navigation Company Orca was planned as an ocean liner for Pacific Steam's passenger service between Britain and the west coast of South America. However, for war service the Shipping Controller had her completed as a cargo ship, without her passenger superstructure. Pacific Steam registered her in Liverpool. Her official number was 140579 and her code letters were JTLW. Royal Mail Steam Packet Company In 1921 Orca returned to Harland & Wolff for her passenger superstructure to be added. She was given berths for 890 passengers: 190 first class, 220 second class and 480 third class. Her public rooms included an entrance hall and First Class lounge decorated in Louis XVI style, a First Class dining room in early Georgian style, and a Smoking Room in Elizabethan style, complete with fireplace. To ascend or descend between decks, passengers had a choice of electric elevators, or a staircase lit by a domed skylight. By the time the refit had been completed at the end of 1922, the Royal Mail Steam Packet Co had full control of Pacific Steam, and Orca and her two sisters were transferred to the RMSP fleet.