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Of interest to those who are building UK mechanical signals... The real semaphores often have two or more cables running up their posts and in the main certainly one cable.
The first and main cable is there for arm proving - On/Off repeater back to the controlling signal box and used further in the interlocking.
The second, and not always present cable, is where the illumination style has been modernised to electric lamp illumination over the former oil lit lamp and the cable provides power to light the lamp. Some posts will have more cables where they have more arms on them to be proved.
So seeing a fine wire/s running up the post would be quite acceptable.
 
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