Top Thrill Dragster the world overtaking both world records from Steel Dragon 2000 at Nagashima Spa Land that was just built three years earlier. It lost the title of being the world's tallest and fastest roller coaster when Kingda Ka at Six Flags Great Adventure opened in May 2005. Intamin designed both Kingda Ka and Top Thrill Dragster, and the two share a similar design and layout that differs primarily by the theme and the additional hill featured on Kingda Ka. The ride had constant downtime in its first couple seasons. Several problems such as the ride's hydraulic system and launch cable caused
Kingda Ka this modification, with entrance gates for the currently-nonexistent row of seats. Kingda Ka's over-the-shoulder restraint system consists of a thick, rigid lap bar and two thin, flexible over-the-shoulder restraints. Because the over-the-shoulder portions of the restraint are not rigid, the hand grips are mounted to the lap bar. Kingda Ka's restraints are also held down by a belt, in case the main locking system fails. To speed loading, riders are asked to secure their own restraints if possible.Kingda Ka's station has two parallel tracks, with switch tracks at the entrance and exit. Each of the station's tracks is designed to