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I would imagine that the number would be astronomical. Then you will have to split it into ones under the wires as opposed to the more normal circuits, you may also like to check out those in wet tunnels?? The ones in Huddersfield tunnel on the right as you face it from the plaform had special dispensation to use a 4 ohm relay as opposed to the standerd which in those days was 8 ohm. This was because the ballast was always saturated and leakage occured across the sleepers etc.
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