{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-13T04:40:26Z",
    "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": 3,
    "engine": "claude",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-06T10:00:00Z",
      "ingestedAt": "2026-10-06T07:05:04+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "revisions": [
      {
        "at": "2026-10-06T22:46:31+00:00",
        "engine": "codex",
        "fields": [
          "agent_conduct",
          "definition",
          "distinguishing_features"
        ],
        "answering_review": "2b9987e31fb8fbe90c962e195d5e19890daeffdd5f769e73e65ffb76c0a88eef"
      }
    ],
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-07T10:10:29+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q27150116",
    "registryId": "vr.tr.flat-crossing",
    "name": "flat crossing",
    "version": "0.2.0-wave.3",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.BLT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q27150116/",
  "model": {
    "registry_id": "vr.tr.flat-crossing",
    "name": "flat crossing",
    "purpose": "Let an agent explain flat railway crossings and their forms, relay design, signalling and standards from railway engineering sources, describe notable examples, and distinguish flat crossings from junctions, level crossings and grade-separated crossings.",
    "definition": "A railway crossing where two tracks cross each other at the same level without a connection allowing trains to turn onto the other track, in forms such as the diamond crossing with fixed obtuse and acute crossings, and the switched diamond crossing in which movable points replace fixed obtuse crossings to allow higher speeds; interlocked signalling may protect conflicting movements but is not a universal feature of flat crossings.",
    "what_it_is_for": "Letting two railway tracks cross at grade.",
    "affordances": [
      "explain forms and design",
      "relay signalling and standards",
      "describe examples",
      "distinguish from related crossings"
    ],
    "distinguishing_features": [
      "Two railway tracks cross at the same level.",
      "Trains cannot change from one crossing track to the other.",
      "Crossings may have fixed or movable components.",
      "Interlocked signalling may be present but is not universal."
    ],
    "appearance": "Two tracks intersecting in an X with crossing rails.",
    "visual_identification": [
      "At-grade crossing of two railway tracks",
      "Diamond crossings, switched diamond crossings, double slips as related layouts",
      "A junction lets trains change tracks; a level crossing is where a road crosses; a flyover separates grades"
    ],
    "physical_properties": [
      {
        "quantity": "typical fixed diamond speed limit",
        "typical_range": "low",
        "unit": "speed",
        "note": "due to gaps"
      },
      {
        "quantity": "switched diamonds",
        "typical_range": "allow higher speeds",
        "unit": "note",
        "note": "by closing gaps"
      }
    ],
    "families_and_kinds": [
      "fixed diamond crossings",
      "switched diamond crossings",
      "single and double slips combining crossing and switching",
      "tram and light rail flat crossings",
      "flat crossings of different gauges"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "switches and crossings",
        "why": "in registry terms"
      },
      {
        "relation": "is a kind of",
        "target": "at-grade intersection",
        "why": "in registry terms"
      },
      {
        "relation": "is a kind of",
        "target": "crossing",
        "why": "in registry terms"
      },
      {
        "relation": "is contrasted with",
        "target": "railway junction",
        "why": "which connects tracks"
      }
    ],
    "identifiers": [],
    "standards_and_regulation": [
      "Railway track and switch and crossing standards such as EN 13232",
      "Signalling and interlocking rules",
      "Infrastructure manager design standards"
    ],
    "failure_modes_and_hazards": [
      "Collision risk if interlocking fails",
      "Wear and noise at crossing gaps",
      "Confusing flat crossings with level crossings"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Describe a flat crossing, its types and its place in a track layout.",
        "Report wear, cracks or noise at a crossing to the infrastructure manager."
      ],
      "must_not": [
        "Route or authorize trains over a flat crossing outside the infrastructure manager's authorized operating rules and applicable signalling arrangements.",
        "Enter the track at a crossing without the protection required by the infrastructure manager.",
        "Disable or bypass interlocking that keeps conflicting moves apart.",
        "Confuse a railway flat crossing with a level crossing used by road traffic."
      ],
      "requires_human": [
        "Any change to signalling or speed limits over a crossing requires human authorization.",
        "Returning a crossing to service after a defect or repair requires human authorization."
      ]
    },
    "ethics": {
      "considerations": [
        "A failure of interlocking at a flat crossing can cause a side collision with many casualties.",
        "Track workers face the highest risk where lines cross."
      ],
      "affected_parties": [
        "Passengers and train crews",
        "Track workers",
        "Residents near the line"
      ]
    },
    "owners": {
      "steward": "The railway infrastructure manager.",
      "master_systems": [
        "Railway infrastructure asset registers"
      ]
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q27150116: flat crossing",
      "url": "https://www.wikidata.org/wiki/Q27150116",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Level junction",
      "url": "https://en.wikipedia.org/wiki/Level_junction",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "understand",
        "name": "Understand",
        "description": "What a flat crossing is.",
        "rationale": "Definition.",
        "layers": [
          {
            "id": "definition",
            "name": "Definition",
            "description": "Definition and forms.",
            "findings": [
              {
                "id": "definition-finding",
                "name": "Definition",
                "description": "Definition.",
                "questions": [
                  {
                    "text": "What is a flat crossing, and how do fixed diamonds, switched diamonds and slips differ?",
                    "kind": "definition"
                  },
                  {
                    "text": "Is the question about a flat crossing, a junction, a level crossing or a flyover?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "geometry",
            "name": "Geometry",
            "description": "Geometry.",
            "findings": [
              {
                "id": "geometry-finding",
                "name": "Geometry",
                "description": "Geometry.",
                "questions": [
                  {
                    "text": "How do crossing angle, obtuse and acute crossings and check rails guide wheels through a diamond?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits the specific component?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "engineer",
        "name": "Engineer",
        "description": "Design and signalling.",
        "rationale": "Regulation.",
        "layers": [
          {
            "id": "design",
            "name": "Design",
            "description": "Design and standards.",
            "findings": [
              {
                "id": "design-finding",
                "name": "Design",
                "description": "Design.",
                "questions": [
                  {
                    "text": "What standards govern flat crossing design, speed and maintenance?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which references are standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "signalling",
            "name": "Signalling",
            "description": "Signalling.",
            "findings": [
              {
                "id": "signalling-finding",
                "name": "Signalling",
                "description": "Signalling.",
                "questions": [
                  {
                    "text": "How does interlocking protect flat crossings and set conflicting routes?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits railway interlocking?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "examples",
        "name": "Examples",
        "description": "Examples.",
        "rationale": "Sources.",
        "layers": [
          {
            "id": "notable",
            "name": "Notable",
            "description": "Notable crossings.",
            "findings": [
              {
                "id": "notable-finding",
                "name": "Notable",
                "description": "Notable.",
                "questions": [
                  {
                    "text": "Where are notable flat crossings, such as Newark and historic mainline diamonds?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits the specific crossing?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "replacement",
            "name": "Replacement",
            "description": "Replacement by flyovers.",
            "findings": [
              {
                "id": "replacement-finding",
                "name": "Replacement",
                "description": "Replacement.",
                "questions": [
                  {
                    "text": "Why are flat crossings replaced by grade separation, and what remains?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which sources are cited?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "context",
        "name": "Context",
        "description": "History and modelling.",
        "rationale": "Context.",
        "layers": [
          {
            "id": "history",
            "name": "History",
            "description": "History.",
            "findings": [
              {
                "id": "history-finding",
                "name": "History",
                "description": "History.",
                "questions": [
                  {
                    "text": "How did flat crossings develop with competing railway companies?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits the history of railway track?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "modelling",
            "name": "Modelling",
            "description": "Model railways.",
            "findings": [
              {
                "id": "modelling-finding",
                "name": "Modelling",
                "description": "Modelling.",
                "questions": [
                  {
                    "text": "How are diamond crossings used in model railways?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits model railway track?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should switched diamond crossing be a separate entry?",
    "How should railway engineering standards be linked?",
    "How should notable examples be linked?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}