You can read more about the fascinating history here: https://about.usps.com/who-we-are/postal-history/pneumatic-tubes.pdf
Credit: https://hachyderm.io/@miah
We had such a system (with only one pipe) a few decades ago in our company. Purpose was to deliver samples from the production to the laboratory. When I started in the late 90’s it was already not in use anymore. I got told that sometimes the pipe got clogged…
More steampunk than solarpunk, but yeah always interesting to read some details about complex but mostly forgotten technology.
In the medicine field this technology isn’t uncommon because you can send samples quickly to the hospital laboratory.
What about this is “punk”? It’s just old technology. I don’t see a reason to give everything a “punk” label.