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At least I dont call a vertical loop a "loopdie-loop"!
When the train is moving, a current is generated which lifts the anti-rollbacks up away from the groves. If the train stops on the lift, the rollbacks fall down. When it is down for a mechanical reason on the lift, the rollbacks will fall down and usually catch the next notch back. If it's just a setup on the lift, they fall but the train still moves forward very slowly by the catchwagon.
On rare occasions for some reason, the current gets lost or something and the rollbacks grind horribly (nothing like a normal rollback). This usually happens near the top.
The problem with the one on Millennium Force was that apparently the wheels weren't making solid contact, slipping, and therefore not lifting the anti-rollbacks up. Cedar Point installed some kind of tape on the rails, similar to what they use on stairs to keep you from slipping. If you look carefully in some of the Expedition GeForce photos, you can see they used a similar substance that was sprayed on.
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Jeff - Webmaster/Admin - CoasterBuzz.com, Sillynonsense.com
"As far as I can tell it doesn't matter who you are. If you can believe, there's something worth fighting for..." - Garbage, "Parade"
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Jeff - Webmaster/Admin - CoasterBuzz.com, Sillynonsense.com
"As far as I can tell it doesn't matter who you are. If you can believe, there's something worth fighting for..." - Garbage, "Parade"
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