Eejanaika - 4th Dimension roller coaster
Eejanaika (ええじゃないか) is a steel 4th Dimension roller coaster at Fuji-Q Highland in Fujiyoshida, Yamanashi, Japan.
Eejanaika is a "4th Dimension" coaster, a design in which the seats can rotate forward or backward 360 degrees in a controlled spin. This is achieved by having four rails on the track: two of these are running rails while the other two are for spin control. The 2 rails that control the spin of the seats move up and down relative to the track and spin the seats using a rack and pinion gear mechanism.
According to the Guinness Book of World Records, Eejanaika is the roller coaster with the most inversions in the world. Throughout the ride, the riders go through 14 inversions. However, most of these inversions are accomplished by spinning the seats rather than actually inverting the track.
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