"live rail" meaning in English

{
  "forms": [
    {
      "form": "live rails",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "live rail (plural live rails)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A rail which provides current (usually direct current (DC)) for electric trains running on third- and fourth-rail electrified systems."
      ],
      "id": "en-live_rail-en-noun-ze2n5N8S",
      "links": [
        [
          "current",
          "current"
        ],
        [
          "direct current",
          "direct current"
        ],
        [
          "DC",
          "DC"
        ]
      ],
      "synonyms": [
        {
          "word": "conductor rail"
        },
        {
          "word": "third rail"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈlaɪv ˈɹeɪl/"
    }
  ],
  "word": "live rail"
}

{
  "forms": [
    {
      "form": "live rails",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "live rail (plural live rails)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Rail transportation"
      ],
      "glosses": [
        "A rail which provides current (usually direct current (DC)) for electric trains running on third- and fourth-rail electrified systems."
      ],
      "links": [
        [
          "current",
          "current"
        ],
        [
          "direct current",
          "direct current"
        ],
        [
          "DC",
          "DC"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈlaɪv ˈɹeɪl/"
    }
  ],
  "synonyms": [
    {
      "word": "conductor rail"
    },
    {
      "word": "third rail"
    }
  ],
  "word": "live rail"
}