In the late 1890s, networks of pneumatic tube systems were installed under city streets to move the mail. Each pneumatic tube canister could hold up to 500 letters. The canisters, also known as ...
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The underground system that shot mail at 35 mph
Beneath the streets of New York once operated one of the strangest transportation systems ever built. The pneumatic mail network stretched nearly 27 miles underground, launching metal capsules through ...
In the late 1890s, networks of pneumatic tube systems were installed under city streets to move the mail. Each pneumatic tube canister could hold up to 500 letters. The canisters, also known as ...
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