Dave -Two rides come to mind that most likely mimic the zipline experience.
The first is in the new area at Busch Gardens Tampa, which feature single-seat cars that hang from a cable which is lifted and lowered to make the car go forward and return. http://www.youtube.com/watch?v=Yczb40OBI4c
The second is Vertigo at Walibi Belgium. This coaster features four-seat inverted cars that roll along a giant cable that serves as the track. This one didn't turn out too well, as it was torn down without operating for more than a few months. http://www.rcdb.com/ig3457.htm?picture=22
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