Comment by astrodust
9 years ago
Show me a working 600mph tube train and then you'll have a case of a superior technology. Until then it's just an idea on a napkin.
China is building new, high-speed maglev trains and there's many lines already open for business.
Maybe one day Hyperloop will get built and will be open for passenger travel. When that day comes it's possible that surface rail may have already achieved the same speed because third or fourth generation maglev trains are in service.
Anything is possible, but you were making the claim they they exist, which they definitely do not. They might theoretically someday exist, but so might Hyperloop.
The idea of a 600mph train running in evacuated tunnels is about as old as the idea of trains itself: http://io9.gizmodo.com/5731620/in-an-alternate-universe-ther...
China is looking at building something like that: http://www.zdnet.com/article/china-developing-600-mph-airles...
Note that it's an above-ground system because the costs of building underground are utterly ridiculous for long distances.