{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-12T08:18:52Z",
    "providers": [
      "Codex"
    ],
    "breadth": "recalled by Codex without web access - no source was read",
    "missingProviders": [],
    "pass": 2,
    "cost": {
      "grok": {
        "seconds": 25.3,
        "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a094b1-89ff-74d1-90c1-ded20fde32ec\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: caboose\nSense to describe: (none recorded)\nDomain code: PHY.OBJ\nAlso known as: (none)\n\n\nContext for this batch of 1001 things:\n# Batch 043: 1001 registe",
        "usd": 0.0,
        "recall": true
      },
      "codex": {
        "seconds": 75.4,
        "error": "WARNING: failed to clean up stale arg0 temp dirs: Access is denied. (os error 5)\nReading additional input from stdin...\nOpenAI Codex v0.153.4\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a094b1-8ab5-72d0-b797-d6b02ebc97d0\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: caboose\nRegistry id: vr.tr.caboose\nPlane / domain: PHY / PHY.OBJ\nReg"
      }
    },
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-06T12:00:00Z",
      "ingestedAt": "2026-10-06T08:43:02+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-07T10:10:26+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q1470867",
    "registryId": "vr.tr.caboose",
    "name": "caboose",
    "version": "0.1.0-research.1",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.OBJ"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q1470867/",
  "model": {
    "registry_id": "vr.tr.caboose",
    "name": "caboose",
    "purpose": "Enable an AI agent to recognise a railway caboose, assess its crew-support and train-service condition, and determine appropriate operation, movement, preservation or reuse.",
    "definition": "A caboose is a railway vehicle traditionally attached to the rear of a freight train to accommodate the train crew and provide a position for observing the train, handling paperwork, and carrying equipment.",
    "scope_statement": "This model owns the caboose as a kind of railway vehicle arranged for freight-train crew accommodation, observation and associated duties, including variants and converted examples; railway usage of the name is provisional pending registry provenance.",
    "in_scope": [
      "Caboose identity, original role and subsequent conversions",
      "Crew compartment, observation arrangements and access",
      "Running gear, couplings and train-brake interfaces",
      "Crew facilities, onboard utilities and service equipment",
      "Condition and suitability for railway movement, occupancy or static display"
    ],
    "out_of_scope": [
      "Locomotive propulsion and train-level driving control",
      "Freight wagon types whose principal purpose is carrying goods",
      "Passenger coaches and their passenger-service requirements",
      "End-of-train devices as independently modelled equipment",
      "Railway operating organisations, routes and signalling systems",
      "Shipboard galleys or other non-railway meanings of caboose"
    ],
    "distinguishing_features": [
      "Its original or documented railway role supports freight-train crew duties rather than primarily carrying freight or passengers.",
      "It has, or originally had, a crew-usable compartment; a rear marker or end-of-train device alone is not a caboose.",
      "A cupola or projecting observation bay supports identification when present, but neither feature should be required without checking the variant.",
      "Being the last vehicle in a train is insufficient for identification; design, fittings and service history must support the classification.",
      "A static cabin or reused body qualifies through documented caboose origin, with its present railway capability recorded separately."
    ],
    "characteristics": [
      {
        "name": "Classification evidence",
        "kind": "relation",
        "unit_or_values": "Builder records, railway diagrams, fleet records, photographs or collection documentation",
        "why_it_matters": "Separates documented cabooses from lookalike vehicles and unsupported labels."
      },
      {
        "name": "Observation arrangement",
        "kind": "category",
        "unit_or_values": "Cupola, projecting bay, other arrangement, no dedicated projection, unknown",
        "why_it_matters": "Identifies variant-specific sightlines, access and clearance considerations."
      },
      {
        "name": "Original crew duties",
        "kind": "category",
        "unit_or_values": "Documented duties such as observation, paperwork, accommodation or switching support",
        "why_it_matters": "Connects the interior arrangement and equipment to the vehicle's intended work."
      },
      {
        "name": "Current use",
        "kind": "state",
        "unit_or_values": "Railway crew service, heritage operation, stored, static display, adapted occupancy, other, unknown",
        "why_it_matters": "Determines which movement and occupancy questions need resolution."
      },
      {
        "name": "Overall envelope",
        "kind": "measurement",
        "unit_or_values": "Length, width and maximum height in mm, with measurement conditions",
        "why_it_matters": "Supports route and transport clearance assessment, including cupola and bay projections."
      },
      {
        "name": "Mass and wheel loading",
        "kind": "measurement",
        "unit_or_values": "Vehicle mass and axle loads in kg, with loading condition",
        "why_it_matters": "Supports movement, lifting and track compatibility decisions."
      },
      {
        "name": "Running-gear configuration",
        "kind": "category",
        "unit_or_values": "Track gauge in mm; axle count; bogie or fixed-axle arrangement; documented component types",
        "why_it_matters": "Identifies the infrastructure and maintenance requirements for rail movement."
      },
      {
        "name": "Brake configuration and readiness",
        "kind": "state",
        "unit_or_values": "Installed train-brake and handbrake arrangements; isolated, untested, defective or verified, with evidence date",
        "why_it_matters": "Distinguishes installed equipment from demonstrated braking capability."
      },
      {
        "name": "Coupling interfaces",
        "kind": "category",
        "unit_or_values": "Coupler, drawgear, buffer and hose types as fitted",
        "why_it_matters": "Determines compatibility with proposed adjacent vehicles."
      },
      {
        "name": "Crew facilities and utility sources",
        "kind": "category",
        "unit_or_values": "Inventory of seating, work surfaces, berths, heating, lighting, sanitation and their supplies where fitted",
        "why_it_matters": "Supports occupancy assessment without assuming every caboose has the same facilities."
      },
      {
        "name": "Movement and occupancy authority",
        "kind": "relation",
        "unit_or_values": "Applicable jurisdiction, operator rules, inspection records and explicit restrictions",
        "why_it_matters": "Prevents historical service or museum presentation from being treated as present authorization."
      }
    ],
    "affordances": [
      "Classify a candidate vehicle using its crew-service arrangement and documented history.",
      "Compare its dimensions, running gear and interfaces with a proposed railway movement.",
      "Assess whether its observation positions and crew compartment support a specified duty.",
      "Identify inspections and repairs needed before movement or occupancy.",
      "Plan preservation or conversion while recording losses of original caboose features."
    ],
    "agent_conduct": {
      "may": [
        "Describe the caboose, its history and uses, citing railway sources.",
        "Identify cabooses in photographs and museum collections."
      ],
      "must_not": [
        "Enter or climb on rail vehicles on active tracks.",
        "Move rolling stock without authority.",
        "Misattribute restored cars' histories.",
        "Encourage trespass on railway property."
      ],
      "requires_human": [
        "Moving historic rolling stock."
      ]
    },
    "ethics": {
      "considerations": [
        "Railway trespass kills people.",
        "Railway heritage deserves preservation."
      ],
      "affected_parties": [
        "Railway workers",
        "Trespassers",
        "Museum visitors"
      ]
    },
    "owners": {
      "steward": "The railway operator or museum that holds it.",
      "master_systems": [
        "Railway rolling stock registers"
      ]
    },
    "what_it_is_for": [
      "Cabooses historically accompanied North American freight trains to provide crew accommodation, workspace and a position for observing the train.",
      "They are now commonly encountered in railway museums, heritage operations and preserved displays, with some retained for specialized railway service."
    ],
    "standards_and_regulation": [
      "Title 49 CFR Part 231, administered by the United States Federal Railroad Administration, prescribes railroad safety appliance requirements, including provisions for caboose cars."
    ],
    "visual_identification": [
      "A caboose usually has an enclosed crew compartment with windows rather than the largely windowless body of a boxcar.",
      "Many examples have a raised roof cupola or projecting side bay windows for observing the train.",
      "End platforms commonly carry railings, steps and a hand brake wheel.",
      "Its railway wheelsets and couplers distinguish it from a road trailer or stationary cabin."
    ],
    "failure_modes_and_hazards": [
      "Uncontrolled movement or coupling impacts can crush people and damage railway equipment.",
      "Defective brakes, wheelsets or running gear can contribute to derailment or loss of control.",
      "Deteriorated steps, platforms and handholds can cause falls.",
      "Legacy coatings and insulation in preserved vehicles may expose occupants or maintenance workers to hazardous substances."
    ]
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q1470867: caboose",
      "url": "https://www.wikidata.org/wiki/Q1470867",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Caboose",
      "url": "https://en.wikipedia.org/wiki/Caboose",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "caboose-identity-and-lineage",
        "name": "Caboose identity and lineage",
        "description": "Establishes what makes the vehicle a caboose and how that identity survives changes of use.",
        "rationale": "Rear-of-train location, appearance and informal naming do not independently establish caboose identity.",
        "layers": [
          {
            "id": "railway-role-boundary",
            "name": "Railway role boundary",
            "description": "Connects classification to the vehicle's intended freight-train crew role.",
            "findings": [
              {
                "id": "documented-crew-service-role",
                "name": "Documented crew-service role",
                "description": "Record the evidence for classification and distinguish original purpose from later assignment.",
                "questions": [
                  {
                    "text": "What documented crew duties led this vehicle type to be designated a caboose?",
                    "kind": "definition",
                    "id": "documented-crew-service-role-q01"
                  },
                  {
                    "text": "Which features and records distinguish it from a passenger coach, brake van, riding car or ordinary freight wagon in the relevant railway vocabulary?",
                    "kind": "boundary",
                    "id": "documented-crew-service-role-q02"
                  }
                ]
              }
            ]
          },
          {
            "id": "variant-and-conversion-history",
            "name": "Variant and conversion history",
            "description": "Tracks design variants, rebuilds and changes that affect recognition or capability.",
            "findings": [
              {
                "id": "original-versus-present-arrangement",
                "name": "Original versus present arrangement",
                "description": "Separate the original caboose configuration from subsequent removals, additions and adaptations.",
                "questions": [
                  {
                    "text": "Which railway diagrams, builder records or dated photographs establish the original observation and crew-compartment arrangement?",
                    "kind": "provenance",
                    "id": "original-versus-present-arrangement-q01"
                  },
                  {
                    "text": "Which conversions changed its crew role or rail capability, and which identifying features remain?",
                    "kind": "boundary",
                    "id": "original-versus-present-arrangement-q02"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "crew-observation-and-accommodation",
        "name": "Crew observation and accommodation",
        "description": "Models the caboose as a workplace and shelter for train crew.",
        "rationale": "Observation positions, workspace and accommodation distinguish caboose utility from simple vehicle transport.",
        "layers": [
          {
            "id": "observation-positions",
            "name": "Observation positions",
            "description": "Examines how crew reach and use windows, bays, cupolas or other viewing positions.",
            "findings": [
              {
                "id": "usable-train-sightlines",
                "name": "Usable train sightlines",
                "description": "Record viewing directions, obstructions and access constraints for the installed observation arrangement.",
                "questions": [
                  {
                    "text": "From which designated positions can crew observe the train or track, and what obstructs those views in the proposed consist?",
                    "kind": "measurement",
                    "id": "usable-train-sightlines-q01"
                  },
                  {
                    "text": "What access, seating, glazing or guarding defects must be resolved before crew use those positions?",
                    "kind": "action",
                    "id": "usable-train-sightlines-q02"
                  }
                ]
              }
            ]
          },
          {
            "id": "crew-space-and-provisions",
            "name": "Crew space and provisions",
            "description": "Connects the interior and its utilities to documented duties and occupancy needs.",
            "findings": [
              {
                "id": "duty-appropriate-habitation",
                "name": "Duty-appropriate habitation",
                "description": "Inventory work, rest and sanitary facilities without treating optional fittings as universal.",
                "questions": [
                  {
                    "text": "What crew complement and duty duration are documented, and which work surfaces, seats, berths or sanitary facilities support them?",
                    "kind": "provenance",
                    "id": "duty-appropriate-habitation-q01"
                  },
                  {
                    "text": "Which heating, lighting, water or electrical supplies are fitted, and what replenishment or servicing do they require?",
                    "kind": "action",
                    "id": "duty-appropriate-habitation-q02"
                  },
                  {
                    "text": "What evidence establishes that doors, exits, ventilation and any combustion appliances are suitable for the proposed occupancy?",
                    "kind": "action",
                    "id": "duty-appropriate-habitation-q03"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "train-integration-and-movement",
        "name": "Train integration and movement",
        "description": "Captures the caboose's mechanical and operational interfaces with a railway consist.",
        "rationale": "A recognisable caboose may still be incompatible with the track, adjacent vehicles or intended movement.",
        "layers": [
          {
            "id": "running-gear-and-clearance",
            "name": "Running gear and clearance",
            "description": "Assesses the physical conditions for supporting and moving the caboose on rails.",
            "findings": [
              {
                "id": "route-and-consist-fit",
                "name": "Route and consist fit",
                "description": "Relate measured geometry, wheel loading and coupling arrangements to a specific movement.",
                "questions": [
                  {
                    "text": "What are its gauge, axle arrangement, mass and maximum envelope, including observation projections and roof fittings?",
                    "kind": "measurement",
                    "id": "route-and-consist-fit-q01"
                  },
                  {
                    "text": "Do its couplers, drawgear, running gear and clearances meet the requirements of the proposed route and adjacent vehicles?",
                    "kind": "action",
                    "id": "route-and-consist-fit-q02"
                  }
                ]
              }
            ]
          },
          {
            "id": "braking-and-train-end-equipment",
            "name": "Braking and train-end equipment",
            "description": "Records braking interfaces and equipment associated with the vehicle's assigned position and duty.",
            "findings": [
              {
                "id": "verified-braking-and-end-functions",
                "name": "Verified braking and end functions",
                "description": "Distinguish equipment presence, function tests and operational requirements for a particular assignment.",
                "questions": [
                  {
                    "text": "Which train-brake connections, crew-accessible brake controls and handbrake arrangements are fitted, and what tests establish their condition?",
                    "kind": "provenance",
                    "id": "verified-braking-and-end-functions-q01"
                  },
                  {
                    "text": "For the proposed train position and operating rules, which markers, communications or other end-of-train functions must be provided?",
                    "kind": "action",
                    "id": "verified-braking-and-end-functions-q02"
                  },
                  {
                    "text": "Which functions belong to separately fitted equipment rather than to the caboose itself?",
                    "kind": "boundary",
                    "id": "verified-braking-and-end-functions-q03"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "condition-serviceability-and-preservation",
        "name": "Condition, serviceability and preservation",
        "description": "Turns evidence about deterioration, inspection and alteration into use-specific decisions.",
        "rationale": "A caboose can be suitable for display while remaining unsuitable for towing or crew occupancy.",
        "layers": [
          {
            "id": "caboose-condition-assessment",
            "name": "Caboose condition assessment",
            "description": "Examines the body, elevated or projecting observation structures, access and railway components.",
            "findings": [
              {
                "id": "structural-and-access-defects",
                "name": "Structural and access defects",
                "description": "Locate deterioration in relation to load paths, crew access and weather exposure.",
                "questions": [
                  {
                    "text": "What inspection evidence covers the underframe, body attachments, end platforms, steps and any cupola or bay-window supports?",
                    "kind": "provenance",
                    "id": "structural-and-access-defects-q01"
                  },
                  {
                    "text": "Where have leakage, corrosion, timber decay or damaged glazing affected crew spaces or structural connections?",
                    "kind": "measurement",
                    "id": "structural-and-access-defects-q02"
                  },
                  {
                    "text": "Which recorded defects prevent rail movement, entry or use of particular crew positions?",
                    "kind": "action",
                    "id": "structural-and-access-defects-q03"
                  }
                ]
              }
            ]
          },
          {
            "id": "use-specific-release-and-conservation",
            "name": "Use-specific release and conservation",
            "description": "Separates movement, occupancy and preservation decisions and their supporting evidence.",
            "findings": [
              {
                "id": "permitted-use-with-evidence",
                "name": "Permitted use with evidence",
                "description": "Record the inspections, responsible authorities and preservation choices supporting each proposed use.",
                "questions": [
                  {
                    "text": "Which issuing bodies, operator requirements and inspection records govern this caboose's proposed movement or occupancy?",
                    "kind": "provenance",
                    "id": "permitted-use-with-evidence-q01"
                  },
                  {
                    "text": "What repairs, tests or restrictions are required before the proposed use can proceed?",
                    "kind": "action",
                    "id": "permitted-use-with-evidence-q02"
                  },
                  {
                    "text": "Which original crew fittings or observation features would a proposed restoration or conversion retain, remove or reconstruct?",
                    "kind": "boundary",
                    "id": "permitted-use-with-evidence-q03"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "evidence-and-external-alignment",
        "name": "Evidence and external alignment",
        "description": "What the world already says about this thing, gathered so the model can be checked against it.",
        "rationale": "A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.",
        "layers": [
          {
            "id": "reported-evidence",
            "name": "Reported evidence",
            "description": "Findings from the breadth pass, kept separate from the structural claims.",
            "findings": [
              {
                "id": "evidence-confidence-notes",
                "name": "Check these first",
                "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                "evidence": [
                  "The railway sense is assumed; caboose can also refer historically to a shipboard cooking place or galley.",
                  "Dimensions, weight, occupancy, and equipment differ substantially by railroad, design, and period, so no typical numerical ranges are asserted.",
                  "Applicable safety rules and remaining operational requirements require jurisdiction-specific verification; no regulatory references are asserted from recall."
                ],
                "questions": [
                  {
                    "id": "evidence-confidence-notes-q01",
                    "text": "Which of these check these first hold for the sense of caboose this model covers, and on what evidence?",
                    "kind": "provenance"
                  }
                ]
              },
              {
                "id": "evidence-kinds",
                "name": "Kinds and varieties",
                "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                "evidence": [
                  "Cupola caboose",
                  "Bay-window caboose",
                  "Extended-vision caboose",
                  "Transfer caboose",
                  "Four-wheel or 'bobber' caboose"
                ],
                "questions": [
                  {
                    "id": "evidence-kinds-q01",
                    "text": "Which of these kinds and varieties hold for the sense of caboose this model covers, and on what evidence?",
                    "kind": "provenance"
                  }
                ]
              },
              {
                "id": "evidence-identifiers",
                "name": "Identifiers and schemes",
                "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                "evidence": [
                  {
                    "scheme": "Railroad reporting mark and equipment number",
                    "value_or_pattern": "Alphabetic reporting mark followed by a railroad-assigned vehicle number",
                    "note": "Identifies an individual vehicle; historical lettering and numbering practices vary by railroad."
                  }
                ],
                "questions": [
                  {
                    "id": "evidence-identifiers-q01",
                    "text": "Which of these identifiers and schemes hold for the sense of caboose this model covers, and on what evidence?",
                    "kind": "provenance"
                  }
                ]
              },
              {
                "id": "evidence-real-world-use",
                "name": "Real-world use",
                "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                "evidence": [
                  "Providing accommodation and workspace for freight-train conductors and brakemen.",
                  "Observing the train for shifted loads, overheated axle bearings, dragging equipment, and other visible problems.",
                  "Carrying tools, signals, records, and supplies needed by the train crew.",
                  "Providing a crew platform on some switching, transfer, and reverse movements.",
                  "Operating as historic rolling stock on museum and heritage railways."
                ],
                "questions": [
                  {
                    "id": "evidence-real-world-use-q01",
                    "text": "Which of these real-world use hold for the sense of caboose this model covers, and on what evidence?",
                    "kind": "provenance"
                  }
                ]
              },
              {
                "id": "evidence-failure-modes-and-hazards",
                "name": "Failure modes and hazards",
                "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                "evidence": [
                  "Derailment or rear-end collision exposing occupants to injury.",
                  "Slack action causing sudden acceleration or deceleration and throwing occupants against fittings.",
                  "Falls while boarding, alighting, or using exterior steps and platforms.",
                  "Failure of brakes, couplers, wheels, or axle bearings.",
                  "Fire or burns associated with heating stoves and their fuel."
                ],
                "questions": [
                  {
                    "id": "evidence-failure-modes-and-hazards-q01",
                    "text": "Which of these failure modes and hazards hold for the sense of caboose this model covers, and on what evidence?",
                    "kind": "provenance"
                  }
                ]
              },
              {
                "id": "evidence-regional-variation",
                "name": "Regional variation",
                "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                "evidence": [
                  "Caboose is chiefly North American terminology; British freight brake vans served overlapping purposes but placed particular emphasis on braking and the guard's duties.",
                  "Cupola and bay-window arrangements reflect different approaches to observing the train, including visibility around tall freight cars.",
                  "Crew vans and guard's vans elsewhere may serve comparable roles, but their braking equipment, accommodation, and operating duties vary."
                ],
                "questions": [
                  {
                    "id": "evidence-regional-variation-q01",
                    "text": "Which of these regional variation hold for the sense of caboose this model covers, and on what evidence?",
                    "kind": "provenance"
                  }
                ]
              },
              {
                "id": "evidence-neighbours",
                "name": "Neighbouring kinds and how to tell them apart",
                "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                "evidence": [
                  {
                    "name": "Brake van",
                    "difference": "Defined principally by its braking provision and associated crew duties; its functions overlap with a caboose, but the terms are not universally interchangeable."
                  },
                  {
                    "name": "End-of-train device",
                    "difference": "An instrument package providing rear-of-train monitoring and signaling functions without accommodation for a crew."
                  },
                  {
                    "name": "Passenger coach",
                    "difference": "Designed primarily to carry passengers rather than support freight-train crew duties."
                  },
                  {
                    "name": "Locomotive",
                    "difference": "Provides tractive power; a caboose is normally unpowered rolling stock."
                  }
                ],
                "questions": [
                  {
                    "id": "evidence-neighbours-q01",
                    "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of caboose this model covers, and on what evidence?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Does the registry provenance confirm the railway meaning of caboose, and does an existing world model already own this concept?",
    "How should caboose relate to brake van, guard's van and riding car across railway traditions without creating duplicate concepts?",
    "Which documented variants establish the limits of the category, including examples without cupolas or projecting observation bays?",
    "Which authoritative railway sources provide variant-specific dimensions, capacities, equipment arrangements and maintenance requirements?",
    "Which jurisdictional and operator rules apply to present-day caboose movement and crew occupancy, and how do they differ from static display requirements?"
  ],
  "statistics": {
    "bundles": 5,
    "layers": 9,
    "findings": 15,
    "questions": 27
  }
}
