There’s a whole 12 part video tutorial on how to do a rollercoaster in Houdini here:
http://sidefx.vislab.usyd.edu.au/houdini_video/index.html
Not sure how developed it is though as I never went through it.
CgTalk:FXWars! Roller Coaster Challenge:3
dantea
#41
ACantarel
#42
Hello Roberto Ortiz!
Maybe, one day, the challenges should be sorted by the topics. “Avalanche” for the avalanches, “Rollercoaster” for the current threads …
What do you think about that?
André
MConte05
#43
Do you think that we could have another award, for “most realistic desgin”? For someone who creates a coaster that would most likely work in real-life, for smoothness, G’s, supports, track desgin, etc.?
DDS
#44
Wow Roberto, U’re really rocking cgtalk with those challenges. I’ll try to find the time to make a great simulation for this.
-D 
colt
#45
I think we’re supposed to link to our finals here. Well, here it is.
It was a lot of fun. Good luck to everyone.
FrankFirsching
#46
Yeah, I almost forgot to link my entry. So here it is:
And to say it with the words of my previous poster: It was really a lot of fun :bounce:
Sir_Vuclan
#47
Yes, The link, I should put that up for people.
Here it is, link to my page:
http://www.cgtalk.com/showthread.php?t=180952&page=2
just scroll down and you’ll find the link to my coaster movie
system
#49
hehe, so, no time for me to finish this contest. i just have some preview, so dont think its enought to show it for vote… 
anyway, have saw some of the final animation… good works for all. it was not an easy subject for sure.waiting to see the result
system
#52
hehe ok roberto, i post it…
so heres is my post http://www.cgtalk.com/showthread.php?p=1796106&posted=1#post1796106
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