The Holloman High Speed Test Track (HHSTT) is a Department of Defense/Air Force aerospace ground test facility located at Holloman Air Force Base in south-central New Mexico. It is adjacent to the White Sands Missile Range and is operated by the 846th Test Squadron of the 96th Test Group of the 96th Test Wing at Eglin Air Force Base.
In 2002, the narrow-gauge track was lengthened to 20,379 ft (6,212 m). The HHSTT currently holds the world land speed record for rocket sleds set in April 2003, at Mach 8.6 or 6,453.409 miles per hour.
As of April 2014, over 12,400 sled tests have been performed at the HHSTT, such as this one.
Source of video: Holloman Air Force Base Instagram