FOF1996, if you were referring to my post, then I guessed you missed my meaning. Anyway, what I meant by expensive to maintain is if the parts are no longer manufactured and would have to be custom made, then it can become really expensive to maintain. And, this has happened before...i.e. The former Screamin' Demon which is now the Thunderbolt Express. I have heard that S&S/Arrow do not make certain parts for these coasters any more as there are not too many left operating, therefore no reason to keep making parts for them.