Bummer about your bones dude.  Yeh, I guess there are not signs all over them, but RAILS CAN BE EXTREMELY DANGEROUS!

My advice is start SHORT and LOW in your selection of rails.  If you do not feel 100% confident about the given rail on that run, just avoid it or ollie it or something.  Stay 100% focused.  Do not look down.  If you feel like you are slipping off the rail, BAIL TO THE SIDE.

Also, stay hydrated.  It helps riding performance a lot including doing park stuff.

Hope this helps and a speedy recovery to you.

The differences in types of rails and mounting techniques would take forever to explain.  FOr the most part, small corrections can be made while sliding on the rail, but it is commonly known that once you feel yourself coming off you need to bail to the side.

ok  thanks. But also i would realy apreciate it if you have any other tips on rails. "the more the merrier"

Sure. 
- Do not mount a rail while going too slow.  You will be more likely to fall.
- Line up your path of approach way early and line it up GOOD.  Just like an airliner coming in for a landing.  If your line is off even one degree it could cause you to bail early -- especially on longer rails.

ok sweet, thanks. the doc says that i can finally go snowboarding this weekend but i dont think I will be doing rails till next season.

Yeh, good luck and stay healthy so you can get in some more quality rail sessions next season.
Let us know how it goes.

Sure, just make a new thread about each different thing and we can chat about it that way.