Wish I knew, i was having a hard time making them even work. The metal object property seems to work better than concrete. There's no soundfx for it, but you can at least glide on them. My skate garage map has some examples so maybe look at that and see what not to do

hi guys, i made a diagram of what the engine searches for:
https://skaterift.com/skaterift/img/rail.svg

it considers any edges with a sharp angle (around 45 degrees or more) as a grind target. if it finds multiple near eachother (within a 0.4m range or so), it merges them together at the center

so for a rail, you want a 3 sided mesh with sharp corners, and no faces on the underneath. that way it fuses them in the top center where the white arrow is. thats where it will stick you to.

as for the material, only thing it cares about is that its got the 'grind target' flag enabled.
hope that helps

cool, will be an easy fix on my rails.

Yep! that seemed to do the trick. Even audio was present with them set as metal. Updated my map file and added a few more rails.