Wikipedia: Railway Mail Service

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The RMS service carried the vast majority of letters and packages mailed in the United States from the end of World War I until the 1960s.

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 Railway Mail Service was a significant factor in reduced mail? transportaion times during the early and middle 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.