"distant signal" meaning in English

{
  "forms": [
    {
      "form": "distant signals",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "distant signal (plural distant signals)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
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        },
        {
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        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "main signal"
        },
        {
          "word": "shunting signal"
        }
      ],
      "glosses": [
        "A railway signal that cannot show a danger aspect, but provides advance warning of the aspect of a signal further ahead."
      ],
      "id": "en-distant_signal-en-noun-aDlcf2ZF",
      "links": [
        [
          "railway signal",
          "railway signal"
        ],
        [
          "danger",
          "danger"
        ],
        [
          "aspect",
          "aspect"
        ]
      ],
      "translations": [
        {
          "code": "nl",
          "lang": "Dutch",
          "lang_code": "nl",
          "sense": "railway signal that provides advance warning",
          "word": "voorsein"
        }
      ]
    }
  ],
  "word": "distant signal"
}

{
  "forms": [
    {
      "form": "distant signals",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "distant signal (plural distant signals)",
      "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 Dutch translations",
        "en:Rail transportation"
      ],
      "coordinate_terms": [
        {
          "word": "main signal"
        },
        {
          "word": "shunting signal"
        }
      ],
      "glosses": [
        "A railway signal that cannot show a danger aspect, but provides advance warning of the aspect of a signal further ahead."
      ],
      "links": [
        [
          "railway signal",
          "railway signal"
        ],
        [
          "danger",
          "danger"
        ],
        [
          "aspect",
          "aspect"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "nl",
      "lang": "Dutch",
      "lang_code": "nl",
      "sense": "railway signal that provides advance warning",
      "word": "voorsein"
    }
  ],
  "word": "distant signal"
}