I have never waxed a rail. Usually I just run my skis over it by hand a few times (my urban skis are beat anyways) If it is particularly bad I will run a file over it, the kind that has diamond grooves instead of lines. I guess wax could work. If it is warm enough even rubbing snow on it can make it slide better, but be carful because at other times snow will actually make it stickier.
i think he's asking about real life not johnny moseley mad trix
you generally dont need to wax the rail but run your ski over it and make sure its smooth, and use some skate wax (or even a candle) if you need to. also take some water with you in case the snow sucks for packing
"America is all about speed. Hot, nasty, badass speed."
-Eleanor Roosevelt, 1936
thats a really nice drop in... im gunna try to build on like it now... but bring lots and lots of water just incase wax is good and def make sure u run ur skiis over the rail so u dotn hit somethin and die first hit... a filer would b good to get any rough spots off 2