"鉄オタ" meaning in Japanese

{
  "etymology_templates": [
    {
      "args": {
        "1": "ja",
        "2": "鉄道",
        "3": "オタク",
        "t1": "railway",
        "tr1": "tetsudō",
        "tr2": "otaku"
      },
      "expansion": "鉄道 (tetsudō, “railway”) + オタク (otaku)",
      "name": "af"
    }
  ],
  "etymology_text": "From 鉄道 (tetsudō, “railway”) + オタク (otaku).",
  "forms": [
    {
      "form": "鉄オタ",
      "ruby": [
        [
          "鉄",
          "てつ"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "tetsuota",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "てつオタ"
      },
      "expansion": "鉄(てつ)オタ • (tetsuota)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms suffixed with オタ",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with 1 kanji",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "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": "ja",
          "name": "Fans (people)",
          "orig": "ja:Fans (people)",
          "parents": [
            "Fandom",
            "People",
            "Culture",
            "Human",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "ja",
          "name": "Rail transportation",
          "orig": "ja:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "railfan"
      ],
      "hyponyms": [
        {
          "roman": "toritetsu",
          "ruby": [
            [
              "撮",
              "と"
            ],
            [
              "鉄",
              "てつ"
            ]
          ],
          "word": "撮り鉄"
        },
        {
          "roman": "noritetsu",
          "ruby": [
            [
              "乗",
              "の"
            ],
            [
              "鉄",
              "てつ"
            ]
          ],
          "word": "乗り鉄"
        }
      ],
      "id": "en-鉄オタ-ja-noun-IWwItMc1",
      "links": [
        [
          "railfan",
          "railfan"
        ]
      ],
      "raw_glosses": [
        "(slang) railfan"
      ],
      "tags": [
        "slang"
      ]
    }
  ],
  "word": "鉄オタ"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "ja",
        "2": "鉄道",
        "3": "オタク",
        "t1": "railway",
        "tr1": "tetsudō",
        "tr2": "otaku"
      },
      "expansion": "鉄道 (tetsudō, “railway”) + オタク (otaku)",
      "name": "af"
    }
  ],
  "etymology_text": "From 鉄道 (tetsudō, “railway”) + オタク (otaku).",
  "forms": [
    {
      "form": "鉄オタ",
      "ruby": [
        [
          "鉄",
          "てつ"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "tetsuota",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "てつオタ"
      },
      "expansion": "鉄(てつ)オタ • (tetsuota)",
      "name": "ja-noun"
    }
  ],
  "hyponyms": [
    {
      "roman": "toritetsu",
      "ruby": [
        [
          "撮",
          "と"
        ],
        [
          "鉄",
          "てつ"
        ]
      ],
      "word": "撮り鉄"
    },
    {
      "roman": "noritetsu",
      "ruby": [
        [
          "乗",
          "の"
        ],
        [
          "鉄",
          "てつ"
        ]
      ],
      "word": "乗り鉄"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Japanese compound terms",
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese slang",
        "Japanese terms spelled with third grade kanji",
        "Japanese terms suffixed with オタ",
        "Japanese terms with 1 kanji",
        "Japanese terms with redundant sortkeys",
        "Pages with 1 entry",
        "Pages with entries",
        "ja:Fans (people)",
        "ja:Rail transportation"
      ],
      "glosses": [
        "railfan"
      ],
      "links": [
        [
          "railfan",
          "railfan"
        ]
      ],
      "raw_glosses": [
        "(slang) railfan"
      ],
      "tags": [
        "slang"
      ]
    }
  ],
  "word": "鉄オタ"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "鉄オタ"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "鉄オタ",
  "trace": ""
}