The train is launched by a hydraulic launch mechanism to 128 miles per hour (206 km/h) in 3.5 seconds. At the end of the launch track, the train climbs the main top hat tower, reaching a height of 456 feet (139 m) and spanning over a 3,118-foot-long (950 m) track by the end of the ride.
Plans to build Kingda Ka were announced on September 10, 2003, at an event held for roller coaster enthusiasts and the media. The event revealed the park's goal to build "the tallest and fastest roller coaster on earth", reaching 456 feet (139 m) and accelerating up to 128 miles per hour (206 km/h) in 3.5 seconds. On January 13, 2005, Kingda Ka's tower construction was completed, and on May 21, 2005, the ride opened to the public. Kingda Ka became the "tallest" and "fastest" roller coaster in the world, taking both world records from Top Thrill Dragster at Cedar Point.
Kingda Ka's four trains are color-coded for easy identification (green, dark blue, teal, and orange) and are numbered; the four colors are also used for the seats and restraints. Each train seats 18 people (two per row). The rear car has one row, while the rest have two. The rear row of each car is positioned higher than its front row for better visibility.
According to wikipedia