Pneumatic tube canister
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Networks of pneumatic tubes speeded mail along 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 of 35 miles per hour.
The first pneumatic tubes were introduced in 1893 in Philadelphia. Boston, Brooklyn, New York, Chicago and St. Louis
also used the system. By 1915, these six cities had more than 56 miles of pneumatic tubes pulsing under the streets.
During World War I, the Post Office Department suspended the service to conserve funding for the war effort.
After the war service was restored in New York and Boston. By the 1950s, it became clear that the end of
pneumatic tubes was in sight as increasing mail volumes and changing urban landscapes made it impractical.
While post offices and businesses moved with relative ease, the underground pneumatic system did not.
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Map of New York City pneumatic tube lines
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