Does anyone have any idea what happens if a capsule breaks down in a tube. Crawling along an evacuated vacuum tube for scores of km doesn't sound enticing.
After all lifts breakdown now, and they don't go that far.
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Kind of like asking what happens if an aircraft breaks down during flight. It's very bad, so lots of engineering has to go into making sure it never happens.
Also, I agree with the article:
> launch a commercial operation by 2021
is an insanely optimistic goal.