I am kind of new to all the roller coaster terminology, and I don't know what rolling stock is! I have heard that it can even make or break a ride. What is it? Thanks!
One word for you: TRAIN.
Seriously. It's the big component that rolls down the track. And no, it isn't a dumb question.
--Dave Althoff, Jr.
I'm a bit surprised you didn't elaborate a bit more, Dave. ;) Since he mentioned it can make or break a ride, I was expecting you to at least link to your page describing different trains and their inner-workings and whatnot...