Saw this article and apparently it's an even earlier idea.. 17th century! https://www.google.com/amp/s/amp.businessinsider.com/history-hyperloop-pneumatic-tubes-as-transportation-2017-8
The real question is whether Musk is Tesla or Edison? Seems more and more like Edison with ripoffs of other inventors.
Dang! I pitched this article idea to Business Insider on August 31st, 2017. Looks like they just in-housed it.