One of my main goals with this bridge was to make an operating train bridge without cutting any track. I think I have succeeded here by using the 'one stud gap' technique. Another tricky thing was making the bridge to the PNLTC standard of having the tracks on the bridge offset by 8 studs (this is so that as the tracks go into a curve off of the straight, the inner track and the outer track start their radius at different locations). I succeeded with this goal.
The other goal was to allow 8 wide trains to travel across the bridge unimpeded. I believe I succeeded there too (see the last photo for more on the width of the bridge).
This photo shows the 8 stud offset between the parallel tracks. It also shows the one stud gap. Your looking at the lifting end of the bridge (the far end from the counter weight). If you look closely, you can see some of the slope work that I used to guide the bridge back into position when as it is closing.
You can also see the width of the bridge here. It is a total of 20 studs wide - 8 for each track, 4 studs between tracks and one stud on either side of the track BEFORE the truss beams start. This is a fairly wide bridge. I was only planning 2 studs between the tracks, but I wasn't able to fit the electrical connectors on with my track configuration if I only had 2 studs there.