Foohy has finally released his awesome rollercoaster addon!
It only works on the Garry’s Mod 13 beta and is available on the workshop (You need to be logged in to see/subscribe).
If you’re new to the workshop just go to that page - click subscribe - then next time you’re in GMod13 it will automatically download and install the addon. Don’t forget to give it a thumbs up!
You can find out more about it, report bugs and ask questions in the official thread right here.