^Funny story about that. I forget who told this one.
So remember how they built half the lift for Rockit and then took it down and rebuilt it? Well here's why... The original lift design was going to use a clutch to hold the chain in place for parking/E-Stops. The idea was that a train could be lowered back down to the station for evacs. Well the state didn't like that and made them put anti-rollback teeth on it.