The editor in screammchines is very simular to no limits. I have both games and hyperrails and i personally prefer the one in screammchines. In No limits, you have the grid in all, like sm, you start off with a peice of track, then yuo click to where you want the next point to be and the track will be bent in a curve to where the new point is. In sm, you add a new peice of straight track, then you bend it the way you want, simular to hr. Either game is a steal, nl looks a bit more realistic, but sm has a lot more track styles. Download the demo for both of them and you will see for yourself