Breaking the Sound Barrier On Land??? On Wednesday, October 15th, 1997, the ThrustSSC was timed at 759.333 miles per hour, which is Mach 1.015. The all-important backup run was successfully made within the hour, at 766.609 miles per hour. After verifying the timing equipment, the USAC officials granted the team a new world land speed… Continue reading World’s Fastest Trust