i guess its no surprise that this kind of thread is in the wrong forum.
anywho, rails damage edges. big fucking deal.
If you're going to be hitting a fair amount of rails, you're going to lose the effectiveness of edging, so you might as well detune the edges BEFORE hitting rails to preserve them longer than you would otherwise. If you use rails as a means of detuning, you might as well just throw your skis against the wall a la Evan Raps.
And I'm not talking about using pansy ass sandpaper or some piece of shit stone; use a hand file and really get that metal off, and nice and round underfoot. You should see full shards of edge coming off, a sign that you are doing the right thing. This will reduce friction, and also reduce the amount of potential material that can be damaged.