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Trains in Switzerland Are Now Running Over Solar Panels in a First-of-Its-Kind Test
(www.zmescience.com)
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There is usually a current present in the rails already
Either traction current, signalling current for track circuits, or both
Depending on the way the signalling system has been engineered
Hmmm neat. I guess those are high voltage signals
Definitely not
Sometimes in the order of mere milivolts