Incidentally, this is one of the things I don't get about Hyperloop versus CHSR: there is nothing inherently cheaper about building an evacuated tube versus putting down a few steel rails. You still need a right of way and grade-separated crossings, and you still need to do all the engineering/environmental work for all that and that's where the expense piles up. You think laying some steel track down on a rock bed is the expensive part? Now, once you have the right of way in place, that's going to be valuable no matter what technology comes down the pike. Amtrak estimates the cost of upgrading the northeast corridor to 220 mph HSR at $160 billion. A lot of money, to be sure, but imagine what it would cost if there wasn't that existing right of way from DC to Boston, through downtown Baltimore, Philadephia, and New York, already in place! That'd be a trillion dollar project, whether you did it with a HSR or Hyperloop or whatever.