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Rollback (roller Coaster)
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A rollback occurs on a Launched Roller Coaster when the Train is not launched fast enough to reach the top of the tower. It will roll backwards down the tower, and will be stopped by Brakes on the Launch Track . Any roller coaster on which a rollback can possibly occur will have these brakes.

Rollbacks are the most common (though still quite rare) on the world's two largest launched roller coasters, '' Kingda Ka '' at Six Flags Great Adventure and '' Top Thrill Dragster '' at Cedar Point . Because of improved technology, Kingda Ka rolls back significantly less often than Top Thrill Dragster.

There are several factors that can cause a rollback:
  • A train that is not completely full. A train with fewer passengers will have less Momentum .

  • Unusual wind gusts could slow the train down enough to cause it to roll back.

  • Cold weather increases Friction in the wheels.

  • A rollback will often occur during the first few test launches each day, as the launch motor has not been sufficiently warmed up by this point. Intentional rollbacks are sometimes conducted during testing.


While the general public may not realize that rollbacks are completely safe and that coasters are designed with them in mind, many coaster enthusiasts look forward to being in one. Being in a rollback essentially gives you a ride and a half, as the train will be launched again after the rollback.