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VIDEO: Pneumatic Tube Mail

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Networks of pneumatic tubes transported mail under city streets beginning in the 1890s. Mail was enclosed in pneumatic tube canisters that could hold up to 600 letters. The canisters traveled at an average speed of 35 miles per hour. The first pneumatic tubes were introduced in 1893 in Philadelphia. Boston, Brooklyn, New York, Chicago and St. Louis. By 1915, these six cities had more than 56 miles of pneumatic tubes underneath the streets. (Smithsonian National Postal Museum via YouTube)

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