@WarfareWW #USAF was able to coast a sled(with superconductor magnets to lift/rockets to thrust) at 633 mph pic.twitter.com/VtLGHuGYiZ— Warfare Worldwide (@WarfareWW) April 24, 2016
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» US Air Force was able to push a sled(with superconductor magnets to lift/rockets to thrust) at 633 mph