Feb 16 2013: Elon Musk is the guy who has claimed he has the plan you mentioned. He has not yet given any further details. These 2 links have more interesting speculation.
http://bentilly.blogspot.se/2012/11/speculating-about-hyperloop.html
http://jacquesmattheij.com/elon-musk-and-the-hyperloop
Also I think your "millions" should be "billions"... the current proposal is a $66 billion train, and Musk estimates his hyperloop costing $6 billion.
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A comment on Conversation: A new way to travel - The Hyper Loop
http://bentilly.blogspot.se/2012/11/speculating-about-hyperloop.html
http://jacquesmattheij.com/elon-musk-and-the-hyperloop
Also I think your "millions" should be "billions"... the current proposal is a $66 billion train, and Musk estimates his hyperloop costing $6 billion.