"signal gantry" meaning in English

{
  "forms": [
    {
      "form": "signal gantries",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "signal gantry (plural signal gantries)",
      "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"
        },
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        },
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          "kind": "other",
          "name": "Terms with German translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "a structure erected over one or more railway tracks, carrying one or more signals. Smaller structures usually have a single support, and larger structures are supported on both sides."
      ],
      "id": "en-signal_gantry-en-noun-Imel0Ma7",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "railway track",
          "railway track"
        ]
      ],
      "raw_glosses": [
        "(rail transport) a structure erected over one or more railway tracks, carrying one or more signals. Smaller structures usually have a single support, and larger structures are supported on both sides."
      ],
      "synonyms": [
        {
          "word": "signal bridge"
        }
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "signal gantry"
}

{
  "forms": [
    {
      "form": "signal gantries",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "signal gantry (plural signal gantries)",
      "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",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with German translations",
        "Translation table header lacks gloss",
        "en:Rail transportation"
      ],
      "glosses": [
        "a structure erected over one or more railway tracks, carrying one or more signals. Smaller structures usually have a single support, and larger structures are supported on both sides."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "railway track",
          "railway track"
        ]
      ],
      "raw_glosses": [
        "(rail transport) a structure erected over one or more railway tracks, carrying one or more signals. Smaller structures usually have a single support, and larger structures are supported on both sides."
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "signal bridge"
    }
  ],
  "word": "signal gantry"
}