pjbr40 Posted September 30, 2013 Share #1 Posted September 30, 2013 Hi I need to ask these questions for curiosity When i was looking at the catenary wire, i noticed they are in two wires. One on the bottom for the pentograph to touch and ride along. But what the purpose for the top one? what those little wire in each sections that touching both top and bottom wire? is there supposed to be some Fra rules on how far apart each pole had to be to hold the straight wire? (I know the turn wire pole are close together then straight Link to comment Share on other sites More sharing options...
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