Elon Musk's concept of a "pneumatic" type of high speed transportation system makes sense to me. However, the problem will be trying to find right-away to build a very straight "tube" from LA to San Francisco.
'Hyperloop' would link LA-SF in 30 mins, if built | UTSanDiego.com:' The only way I can see that right-away could be obtained or such an endeavor, would be to put the complete system underground -- in a tunnel.
The issue is: How can such a tunnel be built at reasonable cost? That's where the NUTS system comes in1
