A Pneumatic Tube System is a system in which cylindrical containers (carriers) are propelled through a complex network of tubes by compressed air or by vacuum. They are used for transporting physical objects.
Where thoughts of conveyor belt sidewalks and rocket ships to the moon were just silly science fiction, the transportation of people via pneumatic tubes was seen not only as a real possibility, but as an inevitability.
On the following pages you will find more information on the Pneumatic City Mail installations in several large cities in the United states of America.