Transcript: The worlds swiftest tractor. The design machines company JCB Devices took a break from developing backhoes to construct a speed tractor. They modified a JCB Fastrac tractor that had a leading speed of 41 mph. The turbocharged tractor is powered by a JCB motor with a big charge cooler filled with ice. There is an electric turbocharger in addition to the key turbocharger. The moment the mods were completed, the tractor had a leading speed of one hundred thirty five mph. British racer Male Martin drove the modified JCB Fastrac, location the file for the Worlds Speediest Tractor (modified).