I witnessed one train roll-back during Hypersonic's opening weekend. It just missed clearing the first hill by a couple of feet. Gravity pulled it back down and these brakes brought it to a halt. A couple of guys in S&S shirts hanging around Hypersonic moved pretty quickly when the train rolled back. After a few quick checks, XLC was back in operation less than 18 minutes later. In later years, a reset after a rollback was even less of a big deal.
©2017 by Joel A. Rogers