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Rollback

Video of a rollback on Kingda Ka.

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 on Top Thrill Dragster and Kingda Ka many times.

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

.