The Railway Mail Service reference article from the English Wikipedia on 24-Apr-2004
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Railway Mail Service

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The United States Postal Service's Railway Mail Service was a significant mail transportation service in the US during the from the mid-19th century until the mid-20th century. The RMS carried the vast majority of letters and packages mailed in the United States from the end of World War I until the 1960s.

The last route run by a railway post office was between New York and Washington, D.C, and ended on June 30, 1977.

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