There's a project in Switzerland to build an underground network of cargo tubes.[1] Cargo Sous Terrain has been making animated videos since 2016, though, and as yet has very little hardware to show.
Their proposed tunnels are 6 meters in diameter and have 3 lanes, traversed by AGVs.
Tunneling is indeed expensive, if that is how this will be build. Given that the footprint of such a system likely will be relatively small it might just be build in the same way we build other underground infrastructure of a similar size.
Or do you think they also didn't bother building sewers in Swiss cities and towns and are still all using outhouses?
> When the guys sitting on piles of nazi gold and the money from dead foreign despots say "nah fam, that shit's too expensive", there's no way anyone else could afford it.
lol, that's one hell of a top tier hyperbolic stereotyping trope supported "argument".
“Expensive” is always a relative term. The Swiss have a good overground rail network and for example branch lines sometimes run combined cargo/passenger trains. No need for dedicated tunnels here. Payoff in a city, especially with little existing rail infrastructure may look different. Hamburg for example tried to establish a 45cm diameter tube mail system in the 1960ies https://de.m.wikipedia.org/wiki/Rohrpost_in_Hamburg and that seems like a more viable concept for a city than a full fledged rail tunnel. The system ultimately failed for multiple reasons, but one was that the vibrations cause by cars and trucks damaged the tubes :(
Their proposed tunnels are 6 meters in diameter and have 3 lanes, traversed by AGVs.
[1] https://www.cst.ch/en