The bridge is based on the version of the 65ft extension to a 55ft one, so that will allow me to make both. If you are interested in this or a 7mm version please let me know.
I have now sourced some double-
Wheels and centre bearings are Ball Bearing races for ease of rotation.
Track electrical pickup is from the circle rail and centre axle. This requires polarity reversal but does mean that any sound equipped loco will continue uninterrupted.
7mm scale scratchbuilt GWR 65ft Turntable in WR guise.