@Daoust ...no, you can't do a 540 on a rail if your starting at 90 dude. it would go 270,450,630,etc. Pretend when he is at 90 that he is about to come off the rail, and then count the spins... easy to see that he gets the 630 around on the very end of the rail and then does a switch 180 out of that.
"doing 5 change ups on a 5 foot rail is about as cool as getting fucked bareback by Charlie Sheen."
-angry snowboarder dude or whatever the fuck his name was