Rail-slides are important to a freestyle skier's arsenal. Many people feel intimidated by rails, so you will look really cool if you can do them well.
Steps
1
Find a low, straight, flat rail. It shouldn't be round or kinked for your first rail. Make sure it's low enough to stand over, so falling won't be as painful.
2
Approach the rail with enough speed to do a 90 degree spin in the air. Do your spin and land on the rail.
3
Make sure you land with the rail under your boot, preferably directly under the ball of your foot.
4
Keep both of your arms in front of you to help maintain your balance.
5
Don't lean in any direction. Keep your skis flat and as close to perpendicular to the rail as possible. The worst thing you can do is lean back (uphill).
6
To dismount, jump near the end of the rail and do a 90 degree spin in either direction, to land either forwards or backwards.