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Tornado

Most coasters with a chain lift have one chain and an anti-rollback device.  This safety device is responsible for the "click-clack" noise associated with roller coasters climbing the first hill.  A saw-toothed strip of metal on the track interacts with the hinged metal "dogs" that fall from the underside of the cars.  These form a linear ratchet that prevents the train from falling backward down the hill. 

Tornado has two chains and no anti-rollback teeth.  It makes for a silent climb up the lift.

Tornado roller coaster

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