In the category of trains with wheels, the French TGV, a high-speed train, is the fastest in the world. On April 3, 2007, under test conditions, the high-speed train consisting of two engine cars and three double-decker passenger cars set the record of 357.2 miles per hour.
In the category of magnetic levitation trains -- where the cars float above a guidance track using powerful electric magnets -- the Japanese JR-Maglev three-car train set a record of 361 miles per hour on December 2, 2003.
But, without people on board -- and with rockets attached -- railed vehicles can go much faster. On April 30, 2003, an unmanned four-stage rocket sled (a small railroad car with rockets strapped to it) reached a speed of 6,416 miles per hour at Holloman Air Force Base in New Mexico.