High Quality Content by WIKIPEDIA articles! The United States Postal Service's Railway Mail Service was a significant mail transportation service in the US during the time period from the mid-19th century until the mid-20th century. The RMS, or its successor the Postal Transportation Service (PTS), carried the vast majority of letters and packages mailed in the United States from the 1890s until the 1960s. George B. Armstrong, manager of the Chicago Post Office, is generally credited with being the founder of the concept of en route mail sorting aboard trains which became the Railway Mail Service. Mail had been carried in locked pouches aboard trains prior to Armstrong's involvement with the system, but there had been no organized system of sorting mail en route, to have mail prepared for delivery when the mail pouches reached their destination city.

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