A rollback is when a launched roller coaster gets launched up the track and falls down before the train makes it to the top of the main hill. This happens mainly on Intamin accelerators such as Top Thrill Dragster, Kingda Ka and Xcelerator, which are known for having large periods of downtime.
Most launched roller coasters have emergency brakes just after or before the launch track to prevent an accident or a collision.
Occasionally, trains may rollback on the lift hill if the anti-rollbacks fails. This can cause a collision with a train in the station.
Often riders hope for a rollback, as they are extremely rare, but riders will receive a second ride without leaving the train.
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