I think it was the recent Model Rail which did a feature on N-gauge layout design.

Rule 1: No turnouts on bridges - there's nowhere to put the point motor.

Here's a work around. And it's cheap and seems reliable enough.

Components: Short length of plastic rod, 1 x track pin, 2 x cable tie stick feet. Elastoplast.

1. Drill a hole underneath the point in line with the tie bar.

2. Drop a track pin through the hole in the tie-bar.

3. Thread a plastic rod through the 2 sticky feet.

4. Pierce the plastic rod with the protruding track pin. Apply Elastoplast to your finger where the track pin enters.

5. Peel off the backing on the sticky feet and align them such that the rod moves smoothly. Note, the track pin swivels in the tie bar, so it doesn't have to be perfect.

NB: A blob of superglue between the stick feet and the bottom of the baseboard will make it rock solid. Lets be honest we want this to last and sticky feet are peelable.

6. The stick feet are slim so easily disguised with the normal side-plating used on a bridge.

On "Roding Reach" the white plastic rods will push through holes in the backscene which will further add strength and hopefully prevent accidental damage.