Need help downloading Rollercoasters

I have been going around and around and looking everywhere for an answer but I can't seem to find one. I have "Rollercoaster Tycoon 3" with all expansions and I am pretty new with downloading extra online content, and everything seems to work with the download instructions I find except in downloading the premade coasters on this and other sites. I was able to transfer my "Rollercoaster Tycoon 2" tracks into: Local Disc C/Documents & Settings/My Name/My Documents/RCT3/Coasters and the old coasters show up just fine when I click on the tool box in the game, and I have been told that this is the same file to put all downloaded premade coasters, but none of them show up in my game. I looked in the coaster section that shows all coaster designs, and they are not in any of those areas, so where would the coasters show up in the game? I have also been told to put them in the PARKS file, but they don't show up in sandbox there either. Also, the files I download say TRACK files, not PARK files. Is this the right file to put them in? Please, can anyone help? Thanks...calia000386

most of the coasters uploaded here are sandbox files, not actual track files. You must place these in C/Documents & Settings/My Name/My Documents/RCT3/Parks

Thanks to all those who helped me out on this, and my problem was solved. So if anyone else has this problem, the files to download coasters is correct, but to find them in the game, they are in the yellow file folders in the coaster section in the game. I didn't realize that all saved coasters go into the folders by the type of coaster.