http://translogic.aolautos.com/2013/07/12/zero-to-4-000-miles-per-hour-in-3-minutes-hyperloop-travel-coul/?icid=maing-grid7%7Cnetscape%7Cdl29%7Csec1_lnk3%26pLid%3D344507
Zero To 4,000 Miles Per Hour In 3 Minutes: Hyperloop Tubes Could Make It Possible