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Bristol Barrow Road - Wiring the Gap



The lift out board - number 19 - has now been fully wired. Power to board 19 is fed via four brass strips on the board which, when the board is in position, make contact with 4 brass sprung plungers obtained from old light bulb connectors.
To enable power to still feed Board 20 when 19 is lifted out power cables have been run down the support legs, across the floor and up the support leg of board 20.
To avoid the potential disaster of engines and stock being accidentally driven into the abyss a dead section of track exists on each side of the gap, on up and down lines, so that power is removed when the lift out board is removed. These four sections of track are controlled by micro-switches. The four on the vertical faces - board 18 and 20 - switch on power when board 19 is in position. The four on the horizontal surface switch on power when the wooden barrier pieces are in position enabling full use of the track when board 19 is out.




Lift out board 19 - pre track fitting photo




Inter board cables




Board 18 connections




Board 18 with barrier in place.




Board 20 without and with barrier.

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Hi Robin.


That all looks very well thought out and neatly executed. I've incorporated a dead section for the last half metre leading to the fiddle yard on "Holt" which will be fed from the fiddle yard area when a cassette is in position.

I must say, your safety barriers appear rather substantial - designed to stop a scale 600 ton train traveling at 150 mph?

The first photo caused a double take with me thinking the curved plain track was not layed, so I presume it's an older photo than the others, as you've clearly got a full, continuous circuit now.



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Hi Dave,

I edited the picture to show it was an earlier photo as obviously the track has been laid since. The barriers are indeed very substantial but only to provide the weight on the micro-switches needed to operate them not for a 600 ton train:-)


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