"rail train" meaning in English

{
  "forms": [
    {
      "form": "rail trains",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rail train (plural rail trains)",
      "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"
        }
      ],
      "glosses": [
        "A train of rolls in a rolling mill, for making rails for railroads from blooms or billets."
      ],
      "id": "en-rail_train-en-noun-NIPn1CSg",
      "links": [
        [
          "train",
          "train"
        ],
        [
          "roll",
          "roll"
        ],
        [
          "bloom",
          "bloom"
        ],
        [
          "billet",
          "billet"
        ]
      ],
      "qualifier": "iron and steel manufacture",
      "raw_glosses": [
        "(iron and steel manufacture) A train of rolls in a rolling mill, for making rails for railroads from blooms or billets."
      ]
    }
  ],
  "word": "rail train"
}

{
  "forms": [
    {
      "form": "rail trains",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rail train (plural rail trains)",
      "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"
      ],
      "glosses": [
        "A train of rolls in a rolling mill, for making rails for railroads from blooms or billets."
      ],
      "links": [
        [
          "train",
          "train"
        ],
        [
          "roll",
          "roll"
        ],
        [
          "bloom",
          "bloom"
        ],
        [
          "billet",
          "billet"
        ]
      ],
      "qualifier": "iron and steel manufacture",
      "raw_glosses": [
        "(iron and steel manufacture) A train of rolls in a rolling mill, for making rails for railroads from blooms or billets."
      ]
    }
  ],
  "word": "rail train"
}