"signal check" meaning in English

{
  "forms": [
    {
      "form": "signal checks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "signal check (plural signal checks)",
      "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"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rail transportation",
          "orig": "en:Rail transportation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1961 April, G. Freeman Allen, “The planning and execution of the new Leeds-Manchester service”, in Trains Illustrated, page 204",
          "text": "Of the failures to do so on the 23 other occasions, six only were attributed to the performance of the locomotives and the remainder to signal checks and permanent way cautions, particularly in the week following a parcels train derailment at Northallerton.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An instance where a train must stop at a red signal, or slow down before passing a signal displaying a yellow aspect."
      ],
      "id": "en-signal_check-en-noun-pUdCSqpJ",
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "train",
          "train"
        ],
        [
          "stop",
          "stop"
        ],
        [
          "slow down",
          "slow down"
        ],
        [
          "yellow",
          "yellow"
        ],
        [
          "aspect",
          "aspect"
        ]
      ],
      "raw_glosses": [
        "(rail transport) An instance where a train must stop at a red signal, or slow down before passing a signal displaying a yellow aspect."
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "signal check"
}

{
  "forms": [
    {
      "form": "signal checks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "signal check (plural signal checks)",
      "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",
        "English terms with quotations",
        "en:Rail transportation"
      ],
      "examples": [
        {
          "ref": "1961 April, G. Freeman Allen, “The planning and execution of the new Leeds-Manchester service”, in Trains Illustrated, page 204",
          "text": "Of the failures to do so on the 23 other occasions, six only were attributed to the performance of the locomotives and the remainder to signal checks and permanent way cautions, particularly in the week following a parcels train derailment at Northallerton.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An instance where a train must stop at a red signal, or slow down before passing a signal displaying a yellow aspect."
      ],
      "links": [
        [
          "rail transport",
          "rail transport"
        ],
        [
          "train",
          "train"
        ],
        [
          "stop",
          "stop"
        ],
        [
          "slow down",
          "slow down"
        ],
        [
          "yellow",
          "yellow"
        ],
        [
          "aspect",
          "aspect"
        ]
      ],
      "raw_glosses": [
        "(rail transport) An instance where a train must stop at a red signal, or slow down before passing a signal displaying a yellow aspect."
      ],
      "topics": [
        "rail-transport",
        "railways",
        "transport"
      ]
    }
  ],
  "word": "signal check"
}