Royal Mail Ships (RMS) were first introduced in 1840, with the first contract for carrying mail awarded in 1850. Only ships which were contracted to carry mail were allowed to feature the designation. The ships proved popular with passengers as they ran on strict timings to ensure that mail was delivered on time.
One of the first contracts given was to The City of Dublin Steam Packet Company which operated between Ireland and Wales. However, probably the company most associated with RMS is The White Star Line group, which is now known as Cunard. White Star Line Group ran famous passenger liners such as the RMS Queen Mary, the RMS Olympic, the RMS Carpathia and even the ill-fated RMS Titanic among its mail carrying fleet throughout the years.