traveling post-office system
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...of transport as each was developed: the stagecoach, steamboat, canals, and railroads; the short-lived Pony Express; and airlines and motor vehicles. It also helped subsidize their development. A traveling post-office system, in which mail could be sorted in transit, was introduced experimentally in 1862, and it made railway mail service the dominant form of mail conveyance well into the 20th...
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