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September 5, 2012 02:27 pm PDT

The secret history of the St. Louis Post Office and its amazing pneumatic tube

In 1905, the St. Louis post office built a two-mile pneumatic tube system to deliver mail between the train station and the post office. It was expensive to maintain ($17,000 per year per mile of tube) and ruined a lot of mail. From Aimee Levitt's article in the Riverfront Times: St. Louis's tubes ran a [...]


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