Replying to Quick urban question

Hey guys tonight im hitting my first urban so im stoked as fuck. My only fear is catching my edge on the rail, because the rail looks like a softer kindof metal. I also just had my skis "tuned up" and my edges were sharpened. So i was wondering if you thing i should file them down or to not worry about it. I usually dont have problems on park rails and boxes wt my edges but idk about this urban. I just dont want to eat shit to bad :) thanksalot