Thanks. Started out a a normal mountain path, then I decided about overhangs, then I found this sharp corner. I had to push a hole in the wall to accomodate the camera and set it to FOV=70. And then I added the cube (rail), bent it the same as the warped path (vdisp), added a pop of railbearring constructions, which I had to edit (I'm so glad with that feature!). I first tried to pop/anchor them on a second invisible rail/wall that was bent the same as the path, but I couldn't make them angle with the rail.
This is path traced, btw. No post. It's a bit on the dark side, though. Took 2h25min at 0.6 and 6, with 0.5 exxagerated GISD, soft shadows with 5 samples. Default rendered this takes 25mins.