{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-12T03:42:37Z",
    "providers": [
      "Claude"
    ],
    "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify",
    "pass": 2,
    "wave": 2,
    "engine": "claude",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-06T00:30:00Z",
      "ingestedAt": "2026-10-05T20:54:36+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "revisions": [
      {
        "at": "2026-10-07T11:30:10+00:00",
        "engine": "codex",
        "fields": [
          "definition",
          "visual_identification"
        ],
        "answering_review": "7e6f123288644c23f091e48a1dd9887f93ebaadd59b43b4786fb12cb9cf0bf07"
      }
    ],
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-07T12:16:32+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q336764",
    "registryId": "vr.tr.railway-junction",
    "name": "railway junction",
    "version": "0.2.0-wave.2",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.BLT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q336764/",
  "model": {
    "registry_id": "vr.tr.railway-junction",
    "name": "railway junction",
    "purpose": "Let an agent explain railway junctions and their types and layouts, describe signalling, operation and capacity, identify notable junctions and hubs with sources, and support railway engineering and history questions.",
    "definition": "A railway junction is a place at which two or more rail routes converge or diverge through connecting tracks; layouts include simple, double, scissors, flying and other grade-separated junctions, and grand unions with connections between crossing routes; lines that merely cross without connecting do not constitute a junction, and a junction station or broader railway hub may contain junctions but is not synonymous with one; signalling and interlocking may control junction movements, and junctions can constrain capacity.",
    "what_it_is_for": "Places where railway lines meet or cross.",
    "affordances": [
      "explain types and layouts",
      "describe signalling and capacity",
      "identify notable junctions",
      "support engineering and history questions"
    ],
    "distinguishing_features": [
      "Track convergence",
      "Interlocked control",
      "Layout types",
      "Capacity constraint"
    ],
    "appearance": "Track layouts with points, crossings and signals where lines converge.",
    "visual_identification": [
      "Connected tracks allow rail routes to converge or diverge.",
      "Points, crossings and signals can support identification, but a crossing without a route connection is insufficient.",
      "A station serves passengers, a siding is a storage track and a level crossing is a crossing with a road."
    ],
    "physical_properties": [
      {
        "quantity": "Track gauge",
        "unit": "millimetres",
        "typical_range": "",
        "note": "Measured between the inner rail faces at the reference position specified by the applicable railway standard."
      },
      {
        "quantity": "Minimum track curve radius",
        "unit": "metres",
        "typical_range": "",
        "note": "Determined from surveyed track centreline geometry for each route through the junction."
      },
      {
        "quantity": "Track gradient",
        "unit": "percent",
        "typical_range": "",
        "note": "Calculated from the change in rail elevation divided by horizontal distance along a specified track segment."
      },
      {
        "quantity": "Junction footprint area",
        "unit": "square metres",
        "typical_range": "",
        "note": "Measured from a surveyed boundary that explicitly defines the included tracks and associated infrastructure."
      }
    ],
    "families_and_kinds": [
      "simple and double junctions",
      "scissors crossings and crossovers",
      "flying and grade-separated junctions",
      "grand unions",
      "junction stations and railway hubs"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "junction",
        "why": "category"
      },
      {
        "relation": "is a kind of",
        "target": "operation point",
        "why": "category"
      },
      {
        "relation": "is related to",
        "target": "public transport",
        "why": "rail services"
      },
      {
        "relation": "is related to",
        "target": "airport terminal",
        "why": "another transport hub entry"
      }
    ],
    "identifiers": [],
    "standards_and_regulation": [
      "Railway signalling and interlocking standards",
      "Track design standards",
      "Safety regulation for railway operations"
    ],
    "failure_modes_and_hazards": [
      "Collisions and derailments at junctions",
      "Capacity bottlenecks and delays",
      "Confusing junction terminology"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Describe junction layouts and their capacity effects from public sources.",
        "Report observed faults at a junction to the infrastructure manager."
      ],
      "must_not": [
        "Enter a railway junction or track area without authorization.",
        "Interfere with points, signals or interlocking at a junction.",
        "Publish detailed vulnerabilities of junction signalling.",
        "Present a timetable through a junction as safe without the operator's approval."
      ],
      "requires_human": [
        "Any change to train routing or signalling at a junction."
      ]
    },
    "ethics": {
      "considerations": [
        "Junction collisions and derailments can kill many people at once.",
        "Railway infrastructure is shared by passengers, freight and communities."
      ],
      "affected_parties": [
        "Passengers and train crews",
        "Track workers",
        "Nearby residents"
      ]
    },
    "owners": {
      "steward": "The railway infrastructure manager.",
      "master_systems": []
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q336764: railway junction",
      "url": "https://www.wikidata.org/wiki/Q336764",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Junction (rail)",
      "url": "https://en.wikipedia.org/wiki/Junction_%28rail%29",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "understand",
        "name": "Understand",
        "description": "What railway junctions are.",
        "rationale": "Engineering.",
        "layers": [
          {
            "id": "types",
            "name": "Types",
            "description": "Types and layouts.",
            "findings": [
              {
                "id": "types-finding",
                "name": "Types",
                "description": "Types.",
                "questions": [
                  {
                    "text": "What types of railway junction exist, from simple and scissors junctions to flying junctions and grand unions?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits a specific layout?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "control",
            "name": "Control",
            "description": "Signalling and interlocking.",
            "findings": [
              {
                "id": "control-finding",
                "name": "Control",
                "description": "Control.",
                "questions": [
                  {
                    "text": "How are junctions controlled by signalling and interlocking to prevent conflicting movements?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits railway signalling?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "operate",
        "name": "Operate",
        "description": "Operation and capacity.",
        "rationale": "Practice.",
        "layers": [
          {
            "id": "capacity",
            "name": "Capacity",
            "description": "Capacity.",
            "findings": [
              {
                "id": "capacity-finding",
                "name": "Capacity",
                "description": "Capacity.",
                "questions": [
                  {
                    "text": "Why are junctions capacity bottlenecks, and how are they redesigned to increase throughput?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits railway capacity?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "hubs",
            "name": "Hubs",
            "description": "Hubs and interchange.",
            "findings": [
              {
                "id": "hubs-finding",
                "name": "Hubs",
                "description": "Hubs.",
                "questions": [
                  {
                    "text": "How do junction stations and railway hubs organise interchange between lines and services?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits a specific hub?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "safety",
        "name": "Safety",
        "description": "Safety and heritage.",
        "rationale": "Context.",
        "layers": [
          {
            "id": "safety",
            "name": "Safety",
            "description": "Safety.",
            "findings": [
              {
                "id": "safety-finding",
                "name": "Safety",
                "description": "Safety.",
                "questions": [
                  {
                    "text": "What accidents have occurred at junctions, and how have they shaped safety regulation, with findings attributed?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Is a railway emergency present now?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "heritage",
            "name": "Heritage",
            "description": "Former and heritage junctions.",
            "findings": [
              {
                "id": "heritage-finding",
                "name": "Heritage",
                "description": "Heritage.",
                "questions": [
                  {
                    "text": "What former junctions survive as heritage or have been reinstated?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits railway heritage?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "learn",
        "name": "Learn",
        "description": "History and teaching.",
        "rationale": "Education.",
        "layers": [
          {
            "id": "history",
            "name": "History",
            "description": "History.",
            "findings": [
              {
                "id": "history-finding",
                "name": "History",
                "description": "History.",
                "questions": [
                  {
                    "text": "How did junction design and signalling develop with railway history?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which references are standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "teach",
            "name": "Teach",
            "description": "Teaching.",
            "findings": [
              {
                "id": "teach-finding",
                "name": "Teach",
                "description": "Teaching.",
                "questions": [
                  {
                    "text": "How can junction operation be taught with diagrams and simulations?",
                    "kind": "action"
                  },
                  {
                    "text": "Which misconceptions arise?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should each layout type be a separate entry?",
    "How should railway infrastructure registers be linked?",
    "How should signalling standards be linked?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}