Doing a royale on a rail is pretty much the same as doing
one on land. There is a differance though, that being that you must keep your
weight on top of the railing. This sounds easy, but is really
the reason most people can't do rails.
One of the harder parts of doing rails is gettign on to them. This is done by
Handy-ing(aka Handing) yourself up. Grab onto the rail, then,
try to jump over the rail. This should be pretty easy. Now, do the same moshion,
but this time land on top of the rail. You may have started sliding, and if so,
you can do rails! Cool! Now, jump on again in the Royale position.
You sould start ot slide immediately. This takes tons of practice, so don't be surprised
if you fall off right away. Keep at it!