I was wondering how they do the backwards part. From my understanding lift hills work like this; The chain dog (I think it is called that) latches on to the chain. The chain moves up and the anti-rollback device clicks in between the grooves on the track. Then once the chain reaches the top the car move off the chain. But on the lift hill on the big grizzly mountain runaway mine cars it somehow manages to go backwards. But I can see the anti rollback track thing. So at the top does something lift the anti-rollback mechanism up? Thats my guess but I may be wrong.