"mineral railway" meaning in English

{
  "forms": [
    {
      "form": "mineral railways",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mineral railway (plural mineral railways)",
      "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"
        }
      ],
      "examples": [
        {
          "ref": "2019, Alan Staniforth, Cleveland Way, page 64",
          "text": "Just before Bloworth Crossing, you'll walk a short distance along the trackbed of the old mineral railway that connected the old ironstone mines at Rosedale with the blast furnaces of Middlesbrough.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A railway used primarily for the transport of ore."
      ],
      "id": "en-mineral_railway-en-noun-fznKb-Cq",
      "links": [
        [
          "railway",
          "railway"
        ],
        [
          "transport",
          "transport"
        ],
        [
          "ore",
          "ore"
        ]
      ]
    }
  ],
  "word": "mineral railway"
}

{
  "forms": [
    {
      "form": "mineral railways",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mineral railway (plural mineral railways)",
      "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",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2019, Alan Staniforth, Cleveland Way, page 64",
          "text": "Just before Bloworth Crossing, you'll walk a short distance along the trackbed of the old mineral railway that connected the old ironstone mines at Rosedale with the blast furnaces of Middlesbrough.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A railway used primarily for the transport of ore."
      ],
      "links": [
        [
          "railway",
          "railway"
        ],
        [
          "transport",
          "transport"
        ],
        [
          "ore",
          "ore"
        ]
      ]
    }
  ],
  "word": "mineral railway"
}