National Postal Museum
Mail sack
c. 1890-1910
The "R.R.B." printed on this sack is the abbreviation for Rail Road Business. Railroad business mail handled in the baggage car did not pass through U. S. Post Offices. Instead, it was dispatched solely between railroad offices. Only matter pertaining to railroad business transactions and operations was permitted; no personal correspondence was allowed because that was prohibited by the Private Express Statute.
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