"signal bridge" meaning in English

{
  "forms": [
    {
      "form": "signal bridges",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "signal bridge (plural signal bridges)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "49 51",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "48 52",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "49 51",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A structure built over railroad tracks on which signals are mounted."
      ],
      "id": "en-signal_bridge-en-noun-r7RTfk8H",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "railroad track",
          "railroad track"
        ]
      ],
      "raw_glosses": [
        "(rail transport, US) A structure built over railroad tracks on which signals are mounted."
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Nautical",
          "orig": "en:Nautical",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "49 51",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "48 52",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "49 51",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "An open platform by the navigating bridge of a warship for the use of signalmen."
      ],
      "id": "en-signal_bridge-en-noun-qMbsr6bH",
      "links": [
        [
          "nautical",
          "nautical"
        ],
        [
          "platform",
          "platform"
        ]
      ],
      "raw_glosses": [
        "(nautical) An open platform by the navigating bridge of a warship for the use of signalmen."
      ],
      "synonyms": [
        {
          "_dis1": "23 77",
          "topics": [
            "rail-transport",
            "railways",
            "transport"
          ],
          "word": "signal gantry"
        }
      ],
      "topics": [
        "nautical",
        "transport"
      ]
    }
  ],
  "word": "signal bridge"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "signal bridges",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "signal bridge (plural signal bridges)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "en:Rail transportation"
      ],
      "glosses": [
        "A structure built over railroad tracks on which signals are mounted."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "railroad track",
          "railroad track"
        ]
      ],
      "raw_glosses": [
        "(rail transport, US) A structure built over railroad tracks on which signals are mounted."
      ],
      "tags": [
        "US"
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    },
    {
      "categories": [
        "en:Nautical"
      ],
      "glosses": [
        "An open platform by the navigating bridge of a warship for the use of signalmen."
      ],
      "links": [
        [
          "nautical",
          "nautical"
        ],
        [
          "platform",
          "platform"
        ]
      ],
      "raw_glosses": [
        "(nautical) An open platform by the navigating bridge of a warship for the use of signalmen."
      ],
      "topics": [
        "nautical",
        "transport"
      ]
    }
  ],
  "synonyms": [
    {
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ],
      "word": "signal gantry"
    }
  ],
  "word": "signal bridge"
}