"0-4-2" meaning in English

{
  "forms": [
    {
      "form": "0-4-2s",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "0-4-2 (plural 0-4-2s)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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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"
        }
      ],
      "examples": [
        {
          "ref": "1952, Cuthbert Hamilton Ellis, The Beauty of Old Trains, page 117",
          "text": "The 2-4-2 tank engines of the Great Eastern and the London and North Western were simply adaptations of 2-4-0 main-line engines; the 0-4-4 tank engine owed its parentage to the archaic 0-4-2 mixed traffic.",
          "type": "quotation"
        },
        {
          "ref": "1988, Edgar J. Larkin, The Railway Workshops of Britain, 1823-1986, page 52",
          "text": "After five 0-4-2 saddle tanks in 1860, all other NLR motive power was constructed at Bow, and none of these early locomotives was fitted with a cab.",
          "type": "quotation"
        },
        {
          "ref": "1975, M. A. Rao, Indian Railways, page 143",
          "text": "The 'Lord Falkland', which pulled the first train from Bombay to Thana on April 14, 1853 was built by the Vulcan Foundry in England and was a '2-4-0' tender engine. This was followed by other locomotives of the 2-4-0, 2-2-0 and 0-4-2 types, which continued in use for a number of years.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Under the Whyte notation, a steam locomotive that has four coupled driving wheels followed by two trailing wheels, with no leading wheels."
      ],
      "id": "en-0-4-2-en-noun-P~FwEtMh",
      "links": [
        [
          "steam locomotive",
          "steam locomotive"
        ],
        [
          "driving wheel",
          "driving wheel"
        ],
        [
          "trailing wheel",
          "trailing wheel"
        ],
        [
          "leading wheel",
          "leading wheel"
        ]
      ]
    }
  ],
  "word": "0-4-2"
}

{
  "forms": [
    {
      "form": "0-4-2s",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "0-4-2 (plural 0-4-2s)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Rail transportation"
      ],
      "examples": [
        {
          "ref": "1952, Cuthbert Hamilton Ellis, The Beauty of Old Trains, page 117",
          "text": "The 2-4-2 tank engines of the Great Eastern and the London and North Western were simply adaptations of 2-4-0 main-line engines; the 0-4-4 tank engine owed its parentage to the archaic 0-4-2 mixed traffic.",
          "type": "quotation"
        },
        {
          "ref": "1988, Edgar J. Larkin, The Railway Workshops of Britain, 1823-1986, page 52",
          "text": "After five 0-4-2 saddle tanks in 1860, all other NLR motive power was constructed at Bow, and none of these early locomotives was fitted with a cab.",
          "type": "quotation"
        },
        {
          "ref": "1975, M. A. Rao, Indian Railways, page 143",
          "text": "The 'Lord Falkland', which pulled the first train from Bombay to Thana on April 14, 1853 was built by the Vulcan Foundry in England and was a '2-4-0' tender engine. This was followed by other locomotives of the 2-4-0, 2-2-0 and 0-4-2 types, which continued in use for a number of years.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Under the Whyte notation, a steam locomotive that has four coupled driving wheels followed by two trailing wheels, with no leading wheels."
      ],
      "links": [
        [
          "steam locomotive",
          "steam locomotive"
        ],
        [
          "driving wheel",
          "driving wheel"
        ],
        [
          "trailing wheel",
          "trailing wheel"
        ],
        [
          "leading wheel",
          "leading wheel"
        ]
      ]
    }
  ],
  "word": "0-4-2"
}