Yeah, from what I've been told GCI's are designed for between 4 and 0 vertical G's. This may be in the middle of the train, but also what you feel is the sudden transition from 3/4g to 0g. That's why you get thrown up on GCI's so quickly, but don't continue to be lifted up over the hill, only float at 0g the rest of the way over. At least this is how I understand it...
And as for SkyRush...it's going to be absolutely batsh*t insane crazy. I can't wait until media day which I will be attending.