he CDX Cyclone is the most advanced Lego® compatible roller coaster model available. With over 900 precision molded pieces, the Cyclone is both fun to build and exciting to play with. The kit assembles into a large 4' long model that can be easily modified into different designs. Functioning just like a real roller coaster, a chain pulls the train to the top of the hill where gravity takes over from there. The Cyclone was designed by a real roller coaster engineer to mimic the scale and functionality of a nostalgic wooden roller coaster.