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while the only car ever to break the sound barrier was the Thrust SSC, which Guinness World Records notes hit just over 763 mph at Nevada's Black Rock Desert in 1997. Down here on terra firma ...

Jaguar prepares a pair of XJRs to serve as Rapid Response Vehicles alongside the previously revealed F-Type Coupe R for the Bloodhound SSC land ... as well as the sound barrier on dry land.