No it's literally a subway system. Putting trains in tunnels isn't something new or revolutionary, that's literally what subways are. And we've been doing it for over a hundred years.

People seem to be locked in on examples in the US of bad subways to mean subways inherently suck. But there are plenty of examples of perfectly working subways, which are highly efficient, comfortable and get you from A to B fast.

There are even places with subways that currently suck, but used to be very good. But car culture has meant rich people use their car and sit in gridlock, while the poor use the subway. This lead to a class difference and the richer class in power gutting funding for public transport. That is what makes it suck, not the principal of the thing.

Everything Elon says is new or revolutionary, usually isn't. The hyperloop (or vacuum train) concept isn't new either, I remember reading a book in the 80s where they had vacuum trains. And there are examples of the idea going back a hundred years or more. The hyperloop idea is so dumb, it can be debunked in a couple of minutes with some back of the envelope calculations. The power requirements alone would be huge. But hey slap some solar panels on that bad boy and it regenerates it's own power right, cause that's how anything works.