I've seen these two letters in a lot of downloads: cs. What is it? I don't know what it is so please tell me.   thx, kingguardian101

cs - custom scenery,
cfr - custom flat rides
ctr - custom tracks

oh ok. just wondering because I was confused  also, what does it mean by custom track

Custom Track for example is a B&M Sitdown Roller Coaster (RC) made by Parallax. Sometimes you need to download and install these sets to use the coaster in the park or track design. Here is the link to what I'm talking about:
http://www.customscenerydepot.com/index....;down=1465
Silvarret, has many great tutorials on YouTube explaining many things with the game. Here is a link if you want to visit his page:
https://www.youtube.com/user/Silvarret/videos

thanks that helps a lot

You're welcome. Glad I could help.

Also, the link you gave me was weird. I tried downloading it, but when i tried to open the design, it just crashed my game. Thanks for the link anyways. Also also, how do you make a ctr?

I know there is a way to, not sure how tho. I'd search YouTube for tutorials if you have time. Also for CS (although there is a lot on RCTGo) the better site to search for it is: CSDepot

Also, the link you gave me was weird. I tried downloading it, but when i tried to open the design, it just crashed my game. Thanks for the link anyways. Also also, how do you make a ctr?

Are you talking about the link I gave you to the B&M Coaster?
There are special instructions for installing it correctly so it won't crash your game.
Here is a video I made on how to install the custom track
https://www.youtube.com/watch?v=iJjWcTOCJ_s
also here is a general link on youtube (to search for videos)
on how to make a custom track.
https://www.youtube.com/results?search_q...k+for+rct3