Which is extremely expensive because it has to withstand huge forces trying to crush it like a an empty coke can..
Hyperloop is neighter "cheap" or "easy" to create. Its approx. 10 times as expensive to operate than "Mad-Lev" trains and 100000x as deadly if something goes wrong.
Malfunction in electric train means that it has to stop.
Malfunction in Hyperloop means all passangers are dead.
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Watch Thunderf00t rant about hyperloop and read his sources. This project is nothing more than a scam to fetch investors money.