Railings with Track Models

I need to construct tracks that resemble those in F-Zero GX because I'm trying to make a racing game. I'm doing this with a nurbs surface so that I have total control over the track's lateral shape (so I can add humps in the centre and so-on). But I'm having trouble getting the railings to operate. I was told to make a replica of every edge on the Nurbs surface, curve them, and then use an array to make my railing model follow the curve.