"four-track" meaning in English

{
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      "expansion": "four-track (not comparable)",
      "name": "en-adj"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
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          "source": "w"
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      ],
      "examples": [
        {
          "ref": "1944 May and June, “Notes and News: Express Travel on Slow Lines”, in Railway Magazine, page 184:",
          "text": "[...] Mr. M. N. Rollason points out that on four-track lines on which the fast lines, in the centre, are flanked by the slow lines, and running at speed is permissible on all four, the traveller can enjoy some quite exciting experiences when trains are doing a \"neck-and-neck\" on adjacent lines.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Synonym of four-tracked."
      ],
      "id": "en-four-track-en-adj-5VqFvruo",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "four-tracked",
          "four-tracked#English"
        ]
      ],
      "raw_glosses": [
        "(rail transport) Synonym of four-tracked."
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "four-tracked"
        }
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "four-track"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "four-track (not comparable)",
      "name": "en-adj"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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        "en:Rail transportation"
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      "examples": [
        {
          "ref": "1944 May and June, “Notes and News: Express Travel on Slow Lines”, in Railway Magazine, page 184:",
          "text": "[...] Mr. M. N. Rollason points out that on four-track lines on which the fast lines, in the centre, are flanked by the slow lines, and running at speed is permissible on all four, the traveller can enjoy some quite exciting experiences when trains are doing a \"neck-and-neck\" on adjacent lines.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Synonym of four-tracked."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "four-tracked",
          "four-tracked#English"
        ]
      ],
      "raw_glosses": [
        "(rail transport) Synonym of four-tracked."
      ],
      "synonyms": [
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          "tags": [
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          "word": "four-tracked"
        }
      ],
      "tags": [
        "not-comparable"
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      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "four-track"
}