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Found reference to one possible "upgrade" from rail - It's not just mag-lev, but mag-lev in a vacuum tube: vactrain.
Since anything approach mach one will jump its tracks, and folks won't tolerate sonic booms, this may well be the one transportation system that gets us from A to B, faster than anything before.
The lack of air resistance could permit vactrains to move at extremely high speeds, up to 6000-8000 km/h (4000-5000 mph or 5-6 times the speed of sound at sea level and standard conditions).
Anyone know of a cheap way to extrude giant "noodles" of concrete tubing?
Vactrain??? That made me motion sick just READING about it.
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