Rollback (roller coaster)

[1] Most coasters contain at least one anti-rollback device to prevent a train from rolling backwards while ascending the main lift.

Rollbacks are most common (though still quite rare) on the world's largest launched roller coasters like Kingda Ka at Six Flags Great Adventure along with somewhat smaller rides such as Stealth at Thorpe Park and launched roller coasters of the same type, such as Xcelerator at Knott's Berry Farm and Storm Runner at Hersheypark.

On some rides, when a rollback occurs with people on board, the train will first be brought back to the station to give the guests the option of getting off; other roller coasters with dual-train dispatch systems disallow backwards returns to the station and the train will simply be launched a second time without the option to disembark.

On extremely rare occasions, a single train may require more than two launches to clear the highest point of the track.

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.