"A4" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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      "examples": [
        {
          "text": "The A4, which runs from London to Bristol, used to be known as the Great West Road."
        }
      ],
      "glosses": [
        "One in a series of alphanumerics used in many national road systems."
      ],
      "id": "en-A4-en-name-BLFAmN93",
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          "name": "British English",
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          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
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      "examples": [
        {
          "ref": "1990, H.C.B. Rogers, Express Steam Locomotive Development in Great Britain and France, Crecy Publishing, →ISBN, page 89:",
          "text": "In a letter to the author he says that when he went to King's Cross in 1936 the A4s were, and had been for some time, at a low ebb in performance.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A4 class, a class of steam locomotive used on the London and North Eastern Railway."
      ],
      "id": "en-A4-en-name-a0FovnYP",
      "links": [
        [
          "rail transport",
          "rail transport"
        ]
      ],
      "raw_glosses": [
        "(UK, rail transport) A4 class, a class of steam locomotive used on the London and North Eastern Railway."
      ],
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        "UK"
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      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
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  "word": "A4"
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    "English terms spelled with numbers",
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  "head_templates": [
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      "args": {},
      "expansion": "A4",
      "name": "en-proper noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "examples": [
        {
          "text": "The A4, which runs from London to Bristol, used to be known as the Great West Road."
        }
      ],
      "glosses": [
        "One in a series of alphanumerics used in many national road systems."
      ],
      "links": [
        [
          "alphanumeric",
          "alphanumeric"
        ]
      ]
    },
    {
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        "en:Rail transportation"
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        {
          "ref": "1990, H.C.B. Rogers, Express Steam Locomotive Development in Great Britain and France, Crecy Publishing, →ISBN, page 89:",
          "text": "In a letter to the author he says that when he went to King's Cross in 1936 the A4s were, and had been for some time, at a low ebb in performance.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A4 class, a class of steam locomotive used on the London and North Eastern Railway."
      ],
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        [
          "rail transport",
          "rail transport"
        ]
      ],
      "raw_glosses": [
        "(UK, rail transport) A4 class, a class of steam locomotive used on the London and North Eastern Railway."
      ],
      "tags": [
        "UK"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "A4"
}