"deadman's brake" meaning in English

{
  "forms": [
    {
      "form": "deadman's brakes",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "dead man's brake",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "deadman's brake (plural deadman's brakes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              13,
              28
            ],
            [
              263,
              278
            ]
          ],
          "ref": "1960 February 26, “High-Voltage Electric Locomotive for British Railways”, in Railway Magazine, page 125:",
          "text": "Two rates of deadman's brake application are provided on the locomotive to suit the class of train being hauled. Selection is by the Braked/Unbraked changeover switch. This does not affect driver-controlled braking, but allows a slower rate of application of the deadman's brake when hauling unbraked stock.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A brake that normally operates under pressure, but engages fully when all pressure is released."
      ],
      "id": "en-deadman's_brake-en-noun-IUpMLA0M",
      "links": [
        [
          "brake",
          "brake"
        ],
        [
          "pressure",
          "pressure"
        ]
      ],
      "related": [
        {
          "word": "dead man's switch"
        }
      ]
    }
  ],
  "word": "deadman's brake"
}

{
  "forms": [
    {
      "form": "deadman's brakes",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "dead man's brake",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "deadman's brake (plural deadman's brakes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "dead man's switch"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              13,
              28
            ],
            [
              263,
              278
            ]
          ],
          "ref": "1960 February 26, “High-Voltage Electric Locomotive for British Railways”, in Railway Magazine, page 125:",
          "text": "Two rates of deadman's brake application are provided on the locomotive to suit the class of train being hauled. Selection is by the Braked/Unbraked changeover switch. This does not affect driver-controlled braking, but allows a slower rate of application of the deadman's brake when hauling unbraked stock.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A brake that normally operates under pressure, but engages fully when all pressure is released."
      ],
      "links": [
        [
          "brake",
          "brake"
        ],
        [
          "pressure",
          "pressure"
        ]
      ]
    }
  ],
  "word": "deadman's brake"
}