I've been on both types of Aline slides.. the fiberglass track, and the one where you ride on rails.. You can do bodily harm on either.. Killington and Pico have slides, which is where I rode them the majority of the time since that location is closest to my place in Vermont.
I think Catamount had one, but apparently it closed.. they do have zip lines..
https://fun107.com/guide-to-new-england-mountain-coasters-and-alpine-slides/
I too survived Action Park