"de-energised" meaning in English

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          "ref": "1952 September, Norman Crump, “Camden Town Signalbox, London Transport”, in Railway Magazine, page 585",
          "text": "Alternatively, they clear when the line is unoccupied to the next signal and when an approaching train occupies a short, normally de-energised, track circuit on the approach side of any of the signals. These normally de-energised track circuits are labelled with a Greek letter to emphasise their difference from the normal track circuits, and are short enough to ensure an adequate restriction of speed being imposed on the train.",
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        "simple past and past participle of de-energise"
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  "lang_code": "en",
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          "ref": "1952 September, Norman Crump, “Camden Town Signalbox, London Transport”, in Railway Magazine, page 585",
          "text": "Alternatively, they clear when the line is unoccupied to the next signal and when an approaching train occupies a short, normally de-energised, track circuit on the approach side of any of the signals. These normally de-energised track circuits are labelled with a Greek letter to emphasise their difference from the normal track circuits, and are short enough to ensure an adequate restriction of speed being imposed on the train.",
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