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Why? Why would anybody build trains like that instead of adopting the hyperloop technology which is faster, much more cheap and more safe?

These are maglev trains in vacuum tubes. What's the difference?

Ok then, I've missed this point. Nevertheless, I thought maglev (as well as high-speed rail) hardware is rater complex and expensive.

Why do you think "hyperloop technology" would be "faster, much more cheap and more safe"?