{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-10-21T20:28:28Z",
    "providers": [
      "Claude"
    ],
    "breadth": "researched by Claude against the sources listed below",
    "pass": 2,
    "wave": 5,
    "engine": "claude",
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-21T20:32:19+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "4 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q801716",
    "registryId": "vr.tr.train-shed",
    "name": "train shed",
    "version": "0.2.0-wave.5",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.BLT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q801716/",
  "model": {
    "registry_id": "vr.tr.train-shed",
    "name": "train shed",
    "purpose": "Let an agent describe train sheds by structure, history and heritage status, and point to maintenance and safety rules.",
    "definition": "A large roof, often with an arched or trussed iron and glass structure, covering the tracks and platforms of a railway station; characteristic of major 19th-century terminals.",
    "what_it_is_for": "Sheltering passengers, platforms and trains from weather.",
    "affordances": [
      "describe structural types",
      "describe notable examples and history",
      "explain heritage protection",
      "explain ventilation and maintenance issues"
    ],
    "distinguishing_features": [
      "Covers tracks and platforms, unlike platform canopies covering only platforms.",
      "Not an engine shed, which houses locomotives for maintenance.",
      "Steam-era sheds needed ventilation for smoke."
    ],
    "appearance": "Forms range from high arched or ridged roofs of iron or steel with glazing, spanning several tracks, to low modular Bush-type roofs with smoke openings above the tracks.",
    "visual_identification": [
      "Arched iron and glass roof over platforms"
    ],
    "physical_properties": [
      {
        "quantity": "clear span of notable single-span sheds",
        "typical_range": "about 73-92",
        "unit": "m",
        "note": "St Pancras about 73.2 m; Philadelphia's former Broad Street shed about 91.6 m"
      }
    ],
    "families_and_kinds": [
      "single-span arched train shed",
      "multi-span train shed",
      "balloon shed",
      "Bush-type shed"
    ],
    "related_models": [
      {
        "relation": "is part of",
        "target": "railway station",
        "why": "building"
      },
      {
        "relation": "is confused with",
        "target": "engine shed",
        "why": "maintenance building"
      },
      {
        "relation": "is confused with",
        "target": "platform canopy",
        "why": "smaller roof"
      },
      {
        "relation": "may be",
        "target": "listed building",
        "why": "heritage"
      }
    ],
    "identifiers": [
      {
        "scheme": "heritage list entry",
        "value_or_pattern": "register-specific",
        "note": ""
      }
    ],
    "standards_and_regulation": [
      "National heritage protection law for listed stations",
      "Structural design codes such as Eurocodes for new sheds",
      "Railway station safety rules"
    ],
    "failure_modes_and_hazards": [
      "Falling glass and corrosion",
      "Roof collapse",
      "Poor air quality with diesel trains"
    ],
    "agent_conduct": {
      "may": [
        "describe structures and history"
      ],
      "must_not": [
        "give structural safety judgements without engineers"
      ],
      "requires_human": [
        "structural assessments by engineers"
      ]
    },
    "ethics": {
      "considerations": [
        "heritage conservation",
        "passenger safety"
      ],
      "affected_parties": [
        "passengers",
        "staff"
      ]
    },
    "owners": {
      "steward": "the station's infrastructure owner",
      "master_systems": [
        "asset registers",
        "heritage lists"
      ]
    },
    "facets_not_applicable": {},
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": []
  },
  "sources": [
    {
      "id": "SRC-001",
      "title": "Q801716",
      "publisher": "Wikidata",
      "url": "https://www.wikidata.org/wiki/Q801716",
      "what_it_supports": "identity of the registry item, labels and sitelinks",
      "url_status": "live"
    },
    {
      "id": "SRC-002",
      "title": "Train shed",
      "publisher": "Wikipedia",
      "url": "https://en.wikipedia.org/wiki/Train_shed",
      "what_it_supports": "general description of the subject",
      "url_status": "live"
    },
    {
      "id": "SRC-003",
      "title": "St Pancras Station and Former Midland Grand Hotel",
      "publisher": "Historic England",
      "url": "https://historicengland.org.uk/listing/the-list/list-entry/1342037?section=official-list-entry",
      "what_it_supports": "Train-shed structure, 240 ft clear span, nineteenth-century history and Grade I listing.",
      "url_status": "blocked"
    },
    {
      "id": "SRC-004",
      "title": "Philadelphia and Reading Railroad: Terminal Station and Trainshed - National Register nomination",
      "publisher": "US National Park Service",
      "url": "https://npgallery.nps.gov/GetAsset/4610585f-2c0a-40f2-8419-5971375b3c70/",
      "what_it_supports": "Reading Terminal's 259 ft 8 in span and Broad Street Station's larger 300 ft 8 in span.",
      "url_status": "live"
    },
    {
      "id": "SRC-005",
      "title": "Erie-Lackawanna Terminal, Hoboken - National Register documentation",
      "publisher": "US National Park Service",
      "url": "https://npgallery.nps.gov/NRHP/GetAsset/05a8d18f-5c83-4ae4-88f7-88d783b042ea",
      "what_it_supports": "Bush-type and balloon-type sheds, structural form, ventilation and historical significance.",
      "url_status": "live"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "structure",
        "name": "Structure",
        "description": "How it is built.",
        "rationale": "Structure decides span and look.",
        "layers": [
          {
            "id": "type",
            "name": "Type",
            "description": "Arched, ridged, multi-span.",
            "findings": [
              {
                "id": "structural-type",
                "name": "Structural type",
                "description": "Type and materials.",
                "questions": [
                  {
                    "text": "What structural type is it?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which materials?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "dimensions",
            "name": "Dimensions",
            "description": "Span and length.",
            "findings": [
              {
                "id": "dimensions",
                "name": "Dimensions",
                "description": "Span, length, height.",
                "questions": [
                  {
                    "text": "What are its span and length?",
                    "kind": "measurement"
                  },
                  {
                    "text": "From which source?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "history",
        "name": "History",
        "description": "Design and building.",
        "rationale": "Sheds reflect their era.",
        "layers": [
          {
            "id": "design",
            "name": "Design",
            "description": "Engineers and dates.",
            "findings": [
              {
                "id": "design-history",
                "name": "Design history",
                "description": "Designer and year.",
                "questions": [
                  {
                    "text": "Who designed it and when?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Has it been altered?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "station",
            "name": "Station",
            "description": "Station context.",
            "findings": [
              {
                "id": "station",
                "name": "Station",
                "description": "Station and line.",
                "questions": [
                  {
                    "text": "Which station is it part of?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which lines use it?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "condition",
        "name": "Condition",
        "description": "Maintenance and safety.",
        "rationale": "Old roofs need care.",
        "layers": [
          {
            "id": "condition",
            "name": "Condition",
            "description": "Inspections.",
            "findings": [
              {
                "id": "condition",
                "name": "Condition",
                "description": "Assessment and date.",
                "questions": [
                  {
                    "text": "What is its condition?",
                    "kind": "provenance"
                  },
                  {
                    "text": "When was it last inspected?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "works",
            "name": "Works",
            "description": "Repairs and restoration.",
            "findings": [
              {
                "id": "works",
                "name": "Works",
                "description": "Project and dates.",
                "questions": [
                  {
                    "text": "Which works were done?",
                    "kind": "provenance"
                  },
                  {
                    "text": "When?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "heritage",
        "name": "Heritage",
        "description": "Protection.",
        "rationale": "Many sheds are listed.",
        "layers": [
          {
            "id": "listing",
            "name": "Listing",
            "description": "Status.",
            "findings": [
              {
                "id": "listing",
                "name": "Listing",
                "description": "Status and grade.",
                "questions": [
                  {
                    "text": "Is it listed or protected?",
                    "kind": "provenance"
                  },
                  {
                    "text": "At what grade?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "significance",
            "name": "Significance",
            "description": "Why it matters.",
            "findings": [
              {
                "id": "significance",
                "name": "Significance",
                "description": "Reasons.",
                "questions": [
                  {
                    "text": "Why is it significant?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which source says so?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}