I don't know, there's some good reasons against it on the page. For example, needing to dig up tubing to make repairs.

I think these systems are really cool but it isn't clear that they are net positive. Even today I would suspect many parcels being too heavy or large for the tube system. You might just end up with the tube system AND vehicular delivery.

The issues section noting how big a pain the breakdowns were reminded me of the first hospital I worked at. There was a lab across the street (and a few more of the hospital's buildings/parking lots before that) for processing blood/urine samples and so they put a the tube system in to make things "easier". It didn't break down every week or anything, but when it did... it was chaos.

They also ended up switching to someone just driving a van - which they already had to have ready to go for when the tube system broke down for days at a time anyways.