The initials R.M.S mean Royal Mail Ship. Titanic was actually a mail ship, with a designated compartment on G deck. Aboard the Titanic was a Sea Post Office with a crew of five clerks, three Americans and two British. They worked thirteen hours a day, seven days a week, classifying about 60,000 items daily. The American sea post clerks earned about $1,000 a year in 1912. They also ate their meals free with the passengers and were allotted an allowance for their board while awaiting the return of their ship.