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Do you remember back in the good old days when there were lots of telegraph wires along the tracks? I sure do. I don't know what they all were for. Probably some for the telegraph itself and some for signals and switch controls. I just found web page that describes some of the issues with these wires. In particular the changing positions of wires as they run from pole to pole. It looks like a twisting effect. This article is rather long but you may want to at least skim it to get an idea of what the position changing, i.e. transpositioning, is all about.

Open Wire Transpositioning Systems