PS Castalia
 Castalia was a 1533 GRT twin-hulled paddle steamer that was built in 1874 by the Thames Ironworks and Shipbuilding Company Leamouth London for the English Channel Steamship Company. She was acquired by the London Chatham and Dover Railway (LCDR) in 1878 but had already been laid up by then and was not operated by the LCDR. In 1883 she was sold to the Metropolitan Asylums Board and converted to a hospital ship. She served until 1904 and was scrapped in 1905.