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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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United States Postal Service