abstract:Royal Mail Ship (sometimes Steam-ship or Steamer), usually seen in its abbreviated form RMS, a designation which dates back to 1840,The first citation in The Times is from 18 August 1840 is the ship prefix used for seagoing vessels that carry mail under contract to the British Royal Mail. Any vessel designated as "RMS" has the right to both fly the pennant of the Royal Mail when sailing and to include the Royal Mail "crown" logo with any identifying device and/or design for the ship.