X²
X² was the world's first "4-Dimension" roller coaster!  This unusual train allows riders to spin in relation to the track.

As of 2017, only two other "4-D" coasters have been built: Eejanaika, written in Japanese as "ええじゃないか", was built in 2006 at Fuji-Q Highland in Fujiyoshida, Japan; and Dinoconda at the China Dinosaurs Park in Xinbei, Changzhou, Jiangsu, China was built in 2012.

©2017 Joel A. Rogers.