Yeah, they were actually kind of practical, at least for some products and geographies: https://en.wikipedia.org/wiki/Pneumatic_tube#Historical_use https://en.

Yeah, they were actually kind of practical, at least for some products and geographies: https://en.wikipedia.org/wiki/Pneumatic_tube#Historical_use https://en.wikipedia.org/wiki/Pneumatic_tube#Historical_use I remember seeing a big one of these built at the CCC Congress. It had some bugs but people were able to use it to send capsules all over the convention center. It was a cool steampunk alternate future kind of experience.