"0-8-4" meaning in English

{
  "forms": [
    {
      "form": "0-8-4s",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "0-8-4 (plural 0-8-4s)",
      "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"
        }
      ],
      "examples": [
        {
          "ref": "1953 April, J. M. Dunn, “Memories of the L.N.W.R. 0-8-4 Tank Engines”, in Railway Magazine, page 237:",
          "text": "The 0-8-4 with its 13 six-wheel coaches generally managed to keep \"neck-and-neck\" with the Tredegar 0-6-0 and its load of five or six coaches, but the combined effort made the welkin ring and excitement reigned among both the train-crews and passengers.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Under the Whyte notation, a steam locomotive that has eight coupled driving wheels followed by four trailing wheels, with no leading wheels."
      ],
      "id": "en-0-8-4-en-noun-SFSc~XUy",
      "links": [
        [
          "steam locomotive",
          "steam locomotive"
        ],
        [
          "driving wheel",
          "driving wheel"
        ],
        [
          "trailing wheel",
          "trailing wheel"
        ],
        [
          "leading wheel",
          "leading wheel"
        ]
      ]
    }
  ],
  "word": "0-8-4"
}

{
  "forms": [
    {
      "form": "0-8-4s",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "0-8-4 (plural 0-8-4s)",
      "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 spelled with numbers",
        "English terms with quotations",
        "English words without vowels",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Rail transportation"
      ],
      "examples": [
        {
          "ref": "1953 April, J. M. Dunn, “Memories of the L.N.W.R. 0-8-4 Tank Engines”, in Railway Magazine, page 237:",
          "text": "The 0-8-4 with its 13 six-wheel coaches generally managed to keep \"neck-and-neck\" with the Tredegar 0-6-0 and its load of five or six coaches, but the combined effort made the welkin ring and excitement reigned among both the train-crews and passengers.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Under the Whyte notation, a steam locomotive that has eight coupled driving wheels followed by four trailing wheels, with no leading wheels."
      ],
      "links": [
        [
          "steam locomotive",
          "steam locomotive"
        ],
        [
          "driving wheel",
          "driving wheel"
        ],
        [
          "trailing wheel",
          "trailing wheel"
        ],
        [
          "leading wheel",
          "leading wheel"
        ]
      ]
    }
  ],
  "word": "0-8-4"
}