I bet these are already being used in the not-so-kept-secret "underground" cities.
Seriously though, these are the types of things we should be considering. Lower infrastructure cost - more efficient energy use, etc.
Although, I guess "teleportation" would even make this obsolete!
http://wewillblowyourmind.blogspot.com.au/2013/10/tesla-hyperloop-train-can-travel-at.html
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