A train at M0.8 near ground level? The very first derailing/crash/etc will demonstrate quite well why this is a poor idea. Planes are quite far from anything easily damageable when they go this fast.
I never understood this argument. The same vulnerability exists with regular high speed rail. In fact... Since it’s protected by a thick steel tube, it’s harder to do that than with a regular Maglev. Leaks take much longer to depressurize a vacuum than you might think and would help slow the vehicle down.
