"permissive working" meaning in All languages combined

{
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    {
      "args": {
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      "expansion": "permissive working (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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            "Entry maintenance"
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          "source": "w"
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        },
        {
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      ],
      "glosses": [
        "A system allowing more than one train at a time to be on the same line in a block section, a signal section, or a dead-end platform line."
      ],
      "id": "en-permissive_working-en-noun-Ln~avgoI",
      "links": [
        [
          "system",
          "system"
        ],
        [
          "train",
          "train"
        ],
        [
          "line",
          "line"
        ]
      ],
      "raw_glosses": [
        "(UK, railways) A system allowing more than one train at a time to be on the same line in a block section, a signal section, or a dead-end platform line."
      ],
      "tags": [
        "UK",
        "uncountable"
      ],
      "topics": [
        "railways",
        "transport"
      ]
    }
  ],
  "word": "permissive working"
}

{
  "head_templates": [
    {
      "args": {
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      "expansion": "permissive working (uncountable)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "British English",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A system allowing more than one train at a time to be on the same line in a block section, a signal section, or a dead-end platform line."
      ],
      "links": [
        [
          "system",
          "system"
        ],
        [
          "train",
          "train"
        ],
        [
          "line",
          "line"
        ]
      ],
      "raw_glosses": [
        "(UK, railways) A system allowing more than one train at a time to be on the same line in a block section, a signal section, or a dead-end platform line."
      ],
      "tags": [
        "UK",
        "uncountable"
      ],
      "topics": [
        "railways",
        "transport"
      ]
    }
  ],
  "word": "permissive working"
}