Lerner wrote: Maglev would certainly be great for long-distance travel. The key thing is to build it underground in evacuated tubes. Of course you have to dig very long tunnels, so the thing would cost tens of billions to build, much like the highway system.
Concrete tubes above ground might be as effective, but far cheaper. It would also allow the possibility of windows. It would be nice to have a view on the trip besides miles and miles of tunnel walls.
