MX Simulator

Im working on my first track so it may be a easy solution but i have no idea what to do, when ever i try to make ruts using raise/lower they come out rough and bumpy, and the top have jagged edges.

If anyone knows how to fix this please let me know.

definetely watch storken's tutorials on youtube. he is very specific and helps out alot.
https://www.youtube.com/playlist?list=P ... Xy7OLbmSrb