Of course, you need to do both rails... Now, on to installing the track. Take the ties we cut out and cut them into pieces as shown. Basically we are cutting out the portions which sit under the rails. Rail nippers work well for this. Dry fit the track on the layout, and mark the holes for the wires on the benchwork. Drill a small hole down through. I used glue to hold my track down, so I spread the glue on the roadbed, then pushed the wires through the holes and pushed the track down in place. After that is done, you can go back and glue in the cut ties so it all looks good.