I understand the rails are filled with sand. It's extremely quiet.
When you're asking where the airtime is, are you asking where to sit on the train or where to expect the airtime along the course of the ride? I'm not sure if it matters where you sit, but I do know there's a nice pop approaching the brake run.
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Matt Lynch
Co-Webmaster, Kennywood Boulevard
http://kennywood.coasterbuzz.com