I understand Powderkeg must be a "sensitive" ride to maintain. If I'm not wrong, it is similar to a rollercoaster that Six Flags St. Louis had in place several years ago...it might still be there...I think it was called "Batman the Ride" or something like that. I visited the park last about '96, and the coaster was closed, but the work crew kept running the ride, testing it over and over. It seems like the coaster I'm thinking about was actually closed for an entire season while they tested it...I think they opened it a year later, maybe with a different name after some changes were made. Some of you St. Louis area folks might remember more about this than I do. But, anyway, when I first saw Powderkeg in action a few years ago I was put in mind of the coaster at Six Flags...I think it took off with a compressed air blast, ran the track, and then went pretty high up to where the track dead ended way up in the air...then the coaster went back to the station backwards on the track.