Royal Mail Ship (RMS) is the ship prefix used for seagoing vessels that carry mail under contract to the British Royal Mail.[1]
History
In the early 19th century, the British Admiralty provided RMS service.[2]
The designation "RMS" has been used since 1840.[3]
In 1850 contracts were awarded to private companies. Having the title "RMS" was seen as a mark of quality and a competitive advantage, because the mail had to be on time.