Its just maglev trains with some novel enclosed design with carriage dissociation?
A bit like this chinese train concept that has drop off/pick up of carriages:*
[0]: It could still have wings but operate under ground effect, though it seems that it would be difficult to keep your leading edge intact travelling just above a hard surface "twice as fast as an airliner". "Twice as fast as an airliner" is Mach 0.85 * 2 = Mach 1.7 at FL360, which translates into Mach 1.5 at sea level. One useful thing we learn from this is that this system will basically have to be propelled by compressed air or electromagnetic force, since props don't work over Mach 1 and we don't have electric turbines.
So maybe it is like a train, one person per, but it runs on cheap road like track, and it's propulsion is provided by fixed stations. If each track was a straight run from station to station you could just ditch the wheels and whatnot and fire the thing between stations along the ground.
There's no way it could move so fast and still use car roads, unfortunately, so it will still have problems buying track space or building tunnels or building elevated paths. Too bad it runs on the ground.
We could look that up. But considering that roads and rails the world over are often build by governments or government owned corporations, I expect Elon Musk to have found a much cheaper way to build his infrastructure.