[Chathamization]

If I remember right, part of the reason why Musk estimated that the hyperloop would be so cheap was that he assumed it could be built on highway meridians for free, and the tracks were to end end far outside the city centers. It also had a fraction of passenger capacity and number of stations as high speed rail.

It seems likely that for the same amount of service as high speed rail, the hyperloop would be a lot more expensive.

[misnome]

Don't forget that the cost estimate included drilling holes in mountains for magically minature amounts of money than current technology provides.

[lallysingh]

Maybe that's why he's not building it himself?