The part of the hyperloop project which worries me the most is stability. The pods have to stay in the tube and cannot make contact with the walls at significant speed. The proposal was to use compressed air to keep it on the wall, kind of like an air hockey puck.
That just sounds implausible. So I did some reading. Turns out, you can buy commercial air bearings which can hold hundreds of tons! A few tons of pod shouldn't be an insurmountable issue.
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