Rocket Sled Breaks World Speed Record At Air Force Test Track

A military rocket train was propelled down a track at nearly nine times the speed of sound yesterday, thereby reaching a world land speed record for rail (though Guinness wasn't invited). The previous record was held by another rocket sled at about mach 8.5. Approximately three miles of the test was inside an inflated… » 2/01/08 12:15pm 2/01/08 12:15pm