A number of famous British ships have a preface of "RMS" in their names which stands for "Royal Mail Ship." Notable examples are the RMS Britannia (1840 - one of the first Cunard ships), RMS Olympic (sister ship of Titannic), RMS Titannic, RMS Carpathia (which rescued survivors of the Titannic sinking), RMS Mauretania (sister ship of the Lusitania), RMS Lusitania, and RMS Queen Mary II (currently in service).
Reminds me of The Dressmaker by Kate Alcott--Captain Rostron of the Carpathia, the ship that rescued the survivors of the Titanic. He cut the heat and steam in order to reach them as soon as possible. He took excellent care of them.
Loss of White Star Line's Olympic-class vessel RMS Titanic which struck an iceberg on 12 April 1912 on her maiden voyage. Surviving wireless operator, Harold Bride, feet bandaged, being carried up gangway, New York.