"running rail" meaning in English

{
  "forms": [
    {
      "form": "running rails",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "running rail (plural running rails)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "65 35",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "66 34",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "72 28",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "1940 December, “Notes and News: Waterloo & City Tube Modernisation”, in Railway Magazine, page 668:",
          "text": "In order to reduce noise to a minimum, the running rails have been welded into 315 ft. lengths.",
          "type": "quote"
        },
        {
          "ref": "2019 October, Roger Ford, “Power failure highlights specification confusion”, in Modern Railways, page 27:",
          "text": "When AC traction was being introduced this was recognised as a threat to track circuits. Harmonics of the switching frequency would appear in the traction return currents in the running rails and, potentially, this would cause wrong-side track circuit failures.",
          "type": "quote"
        }
      ],
      "glosses": [
        "One of the two rails of a railway track with which the wheels of a train make contact."
      ],
      "id": "en-running_rail-en-noun-Pc1Tgo~D",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "railway track",
          "railway track"
        ]
      ],
      "raw_glosses": [
        "(rail transport, usually in the plural) One of the two rails of a railway track with which the wheels of a train make contact."
      ],
      "tags": [
        "plural-normally"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    },
    {
      "categories": [
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Horse racing",
          "orig": "en:Horse racing",
          "parents": [
            "Equestrianism",
            "Horses",
            "Animal riding",
            "Sports",
            "Equids",
            "Livestock",
            "Transport",
            "Human activity",
            "Odd-toed ungulates",
            "Agriculture",
            "Animals",
            "All topics",
            "Human behaviour",
            "Mammals",
            "Applied sciences",
            "Lifeforms",
            "Fundamental",
            "Human",
            "Vertebrates",
            "Sciences",
            "Life",
            "Chordates",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A fence which marks the inside edge of a racecourse track."
      ],
      "id": "en-running_rail-en-noun-jqFFtUCb",
      "links": [
        [
          "horse racing",
          "horse racing"
        ],
        [
          "fence",
          "fence"
        ],
        [
          "racecourse",
          "racecourse"
        ]
      ],
      "raw_glosses": [
        "(horse racing) A fence which marks the inside edge of a racecourse track."
      ],
      "topics": [
        "hobbies",
        "horse-racing",
        "horseracing",
        "horses",
        "lifestyle",
        "pets",
        "racing",
        "sports"
      ]
    }
  ],
  "word": "running rail"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "running rails",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "running rail (plural running rails)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English terms with quotations",
        "en:Rail transportation"
      ],
      "examples": [
        {
          "ref": "1940 December, “Notes and News: Waterloo & City Tube Modernisation”, in Railway Magazine, page 668:",
          "text": "In order to reduce noise to a minimum, the running rails have been welded into 315 ft. lengths.",
          "type": "quote"
        },
        {
          "ref": "2019 October, Roger Ford, “Power failure highlights specification confusion”, in Modern Railways, page 27:",
          "text": "When AC traction was being introduced this was recognised as a threat to track circuits. Harmonics of the switching frequency would appear in the traction return currents in the running rails and, potentially, this would cause wrong-side track circuit failures.",
          "type": "quote"
        }
      ],
      "glosses": [
        "One of the two rails of a railway track with which the wheels of a train make contact."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "railway track",
          "railway track"
        ]
      ],
      "raw_glosses": [
        "(rail transport, usually in the plural) One of the two rails of a railway track with which the wheels of a train make contact."
      ],
      "tags": [
        "plural-normally"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    },
    {
      "categories": [
        "en:Horse racing"
      ],
      "glosses": [
        "A fence which marks the inside edge of a racecourse track."
      ],
      "links": [
        [
          "horse racing",
          "horse racing"
        ],
        [
          "fence",
          "fence"
        ],
        [
          "racecourse",
          "racecourse"
        ]
      ],
      "raw_glosses": [
        "(horse racing) A fence which marks the inside edge of a racecourse track."
      ],
      "topics": [
        "hobbies",
        "horse-racing",
        "horseracing",
        "horses",
        "lifestyle",
        "pets",
        "racing",
        "sports"
      ]
    }
  ],
  "word": "running rail"
}