I have two lift bridges on my layout, one is the Mianne power lift-bridge, the other is the one I just added to get to my freight yard.
In both cases, lining up the tracks is fairly simple, you build the bridge and perfect it's function, then lay the track like the bridge isn't there. Once the track is laid, I used a Dremel to cut the tracks at the junction, and since they were secured on both sides, they line up perfectly when either bridge is closed.
The freight yard bridge has hinges that are above the track head so that the track swings away from the cut when you lift the bridge. The track on the opposing side (left) is cut at a slight angle so that it won't clash as the bridge is lifted. Brass aligning pins keep the bridge in perfect alignment at the left side, the hinges do the same on the right side. Note that there are ten tracks on the freight yard bridge, and all of them line up perfectly and the transition onto and off of the bridge is as smooth as regular track.
Mianne power Lift Bridge
Manual Lift Bridge To Freight Yard
