I reopened this thread... it's been about a year since we've had this discussion and there are a lot of new people here. Veterans, please bare with me.
Here's the story on Mean Streak: It's too big and has the wrong trains. The trims are there to keep the ride from tearing itself apart and making it anymore uncomfortable than it already is.
Here's the chain of events, inspired by Dave Althoff's opinion because it makes good sense to me. The cars can't articulate, that is the axles can not pivot to turn in the track. Think Hot Wheels cars... the wheels can't "steer."
Since they can't articulate, they tend to bounce around a lot in the turns. A kind of repetitive bounce off of the side of the track. This shakes the riders, shakes the ride and causes the car to bounce up and down. While the wheels slide and bounce around, that causes grooves to form in the track rails, which leads to more vibration. The faster the train moves, the worse all of this gets.
Want to see just how bad these trains move through the track? Watch as a train ascends the hill after the first drop. You can see each car, one after another, jerk to one side (don't remember which way) as it "finds" the curve. Is it any wonder there's a carpenter on that piece of track every morning?
So that's the short explanation, though I'm certainly no expert.
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Jeff
Webmaster/Guide to The Point