a rollback. This happened three times on Top Thrill Dragster. All three times, a ride mechanic had to take an elevator to the top, and give the train a small push so it could complete the ride. It has also happened twice on Stealth at Thorpe Park, both during early morning tests. Maverick at Cedar Point tests roll backs every morning during testing. Examples In a video of a rollback on Stealth at Thorpe Park, the train is seen to reach slightly over halfway over the midpoint at the top. The train proceeded to roll back, due to an insufficiently powerful launch, combined with an uneven distribution of weight on the train in April 2006. Stealth also had a rollback in March 2008 due to strong winds. References External links Footage of a rollback on Kingda Ka Footage of Top Thrill Dragster stuck in 2005 Launched roller coasters Roller coaster elements