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Holes for third rail insulators


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I don't think I would use all those holes for insulators; I just took a look at one of my SR Electric albums and the average "pot" spacing appears to be every 5th sleeper (closer at junctions, rail breaks etc).

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I've always gone by the "4th sleeper/plain track, 3rd sleeper/exceptions" rule of thumb which seems to be borne out by Russ Elliot's excellent resource (linked above).

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