{ "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-12T09:28:26Z", "providers": [ "Codex" ], "breadth": "recalled by Codex without web access - no source was read", "missingProviders": [], "pass": 2, "cost": { "grok": { "seconds": 25.4, "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: 01a094f1-0232-7ad3-8216-805c659e10b1\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: EMD SD40-2\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 regi", "usd": 0.0, "recall": true }, "codex": { "seconds": 89.1, "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: 01a094f1-023c-7bf3-97eb-1768623f37d9\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: EMD SD40-2\nRegistry id: vr.tr.emd-sd40-2\nPlane / domain: PHY / PHY.OBJ\nRegistry definition: (none recorded)\nNames folded into this entry: (none)\n\n\nCo" } }, "enrichment": { "pass": 3, "engine": "claude", "producedAt": "2026-10-06T12:00:00Z", "ingestedAt": "2026-10-06T08:51:29+00:00", "fields": [ "agent_conduct", "ethics", "failure_modes_and_hazards", "owners", "standards_and_regulation", "visual_identification" ] }, "revisions": [ { "at": "2026-10-07T11:06:04+00:00", "engine": "codex", "fields": [ "agent_conduct" ], "answering_review": "6827cf5276a1ac6206f4e71503a97a808270fd9a3361f4fe71916859924e8c9a" } ], "gate": { "passed": true, "version": "1.0", "at": "2026-10-07T12:16:28+00:00", "evidence": [ "completeness 1.00", "sense: Wikidata description", "2 live sources", "review by codex: pass" ] } }, "metaModel": { "id": "THING-Q1189477", "registryId": "vr.tr.emd-sd40-2", "name": "EMD SD40-2", "version": "0.1.0-research.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.OBJ" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q1189477/", "model": { "registry_id": "vr.tr.emd-sd40-2", "name": "EMD SD40-2", "purpose": "Enable an AI agent to recognize an EMD SD40-2, distinguish its documented configuration from subsequent modifications, and assess what evidence is needed before operation, maintenance, or movement.", "definition": "The EMD SD40-2 is a six-axle, 3,000-horsepower diesel-electric freight locomotive model introduced by General Motors' Electro-Motive Division in 1972, combining a turbocharged 16-cylinder diesel engine with electric traction motors on all six axles.", "scope_statement": "This model owns the recognition criteria and configuration-dependent assessment questions for the EMD SD40-2 locomotive design registered as vr.tr.emd-sd40-2 in PHY / PHY.OBJ; individual locomotives supply evidence against this model.", "in_scope": [ "SD40-2 design identity, builder documentation, and boundaries with related locomotive models", "Prime mover, electrical transmission, traction equipment, and control configuration", "Truck, wheelset, braking, and physical compatibility characteristics", "Configuration-dependent operating states, limitations, and protective functions", "Maintenance evidence, modifications, and return-to-service prerequisites" ], "out_of_scope": [ "The general diesel-electric locomotive kind and principles shared across locomotive designs", "Individual locomotive ownership, dispatch, and maintenance transactions", "Separate models for the SD40, SD40T-2, SD38-2, or other related designs", "Standalone engineering models of the 645 engine, traction motors, and air-brake components", "Railway infrastructure, train scheduling, and network operating rules", "Miniature models, simulators, and merchandise depicting the SD40-2" ], "distinguishing_features": [ "Require builder or equivalent technical records identifying SD40-2; a painted designation or road number alone does not establish the model.", "Check the documented combination of C-C wheel arrangement, 16-645E3 turbocharged engine, and nominal 3,000 hp rating against the relevant build configuration. A railroad specification records this combination: [Milwaukee Road locomotive manual](https://milwaukeeroadarchives.com/Steam/1975%20Diesel%20Locomotive%20Manual%20Milwaukee%20Road.pdf).", "Distinguish an SD40-2 from an SD40 by documented original model and electrical-control configuration; similar engine power does not resolve identity.", "Compare cooling-system arrangement and builder designation when distinguishing an SD40-2 from an SD40T-2; require configuration evidence before interpreting external resemblance.", "Separate an originally built SD40-2 from another locomotive rebuilt to similar equipment standards by retaining both original design identity and the documented rebuild designation." ], "characteristics": [ { "name": "Design identity evidence", "kind": "relation", "unit_or_values": "Builder model designation linked to serial, order, and applicable technical records", "why_it_matters": "Establishes whether the SD40-2 model applies despite renumbering or rebuilding." }, { "name": "Configuration lineage", "kind": "category", "unit_or_values": "Documented original configuration; documented modified configuration; unresolved", "why_it_matters": "Prevents original specifications from being applied automatically to modified locomotives." }, { "name": "Prime mover configuration", "kind": "category", "unit_or_values": "Engine model, cylinder configuration, aspiration, and installed modifications", "why_it_matters": "Determines which power, cooling, lubrication, and maintenance evidence is applicable." }, { "name": "Rated power", "kind": "measurement", "unit_or_values": "hp and kW, with rating basis and configuration reference", "why_it_matters": "Distinguishes engine rating from traction output and records any derating." }, { "name": "Electrical transmission configuration", "kind": "category", "unit_or_values": "Main generating equipment, rectification equipment, traction motor types, and control system", "why_it_matters": "Determines compatible troubleshooting procedures and operating limits." }, { "name": "Truck and wheelset configuration", "kind": "category", "unit_or_values": "Wheel arrangement, truck design, axle equipment, and wheel profile specification", "why_it_matters": "Supports identification and infrastructure compatibility without assuming one truck configuration." }, { "name": "Operating mass and axle loading", "kind": "measurement", "unit_or_values": "kg or t, with fuel, consumable, ballast, and axle-distribution basis", "why_it_matters": "Constrains route access and lifting or recovery arrangements." }, { "name": "Physical clearance envelope", "kind": "measurement", "unit_or_values": "Length, width, and height in mm; track gauge in mm; documented curve limits in m", "why_it_matters": "Supports movement assessment using the actual equipment configuration." }, { "name": "Gearing and speed limit", "kind": "measurement", "unit_or_values": "Gear tooth ratio and permitted speed in km/h or mph", "why_it_matters": "Links installed traction equipment to powered and towed movement limits." }, { "name": "Brake configuration", "kind": "category", "unit_or_values": "Air-brake equipment designation; dynamic brake fitted, absent, isolated, or unresolved", "why_it_matters": "Determines which braking functions may be assessed or relied upon." }, { "name": "Service eligibility", "kind": "state", "unit_or_values": "Unassessed; available; restricted; isolated; out of service", "why_it_matters": "Expresses an evidence-based conclusion for a stated task, jurisdiction, and time." } ], "affordances": [ "Identify which SD40-2 technical documentation applies to a locomotive's build and modification history.", "Compare documented installed equipment with the SD40-2 reference configuration and flag unresolved substitutions.", "Assess whether recorded dimensions, loading, gearing, and brake equipment support a proposed movement.", "Identify missing inspections or unresolved defects that prevent a service-readiness conclusion.", "Select configuration-specific maintenance and troubleshooting references.", "Explain which operating capabilities remain available under documented equipment isolation or restrictions." ], "agent_conduct": { "may": [ "Use external features and road numbers to suggest a possible identification, confirming the model only through builder or equivalent technical records identifying the unit as an SD40-2.", "Report the status, owner and rebuild history of a unit from railway records.", "Record the condition of a unit for its owner." ], "must_not": [ "Move, start or operate a locomotive without authority and a qualified crew.", "Present a rebuilt or upgraded unit as original without disclosure.", "Enter track or yards without permission to observe units.", "Misstate a unit's condition or hours in a sale." ], "requires_human": [ "Returning a unit to service or retiring it requires human authorization.", "Selling, rebuilding or scrapping a unit requires human authorization." ] }, "ethics": { "considerations": [ "Heavy freight trains carry dangerous goods through communities; locomotive reliability matters to them.", "Old diesel units add to local air pollution along rail lines." ], "affected_parties": [ "Train crews and yard workers", "Communities along rail lines", "Railway owners" ] }, "owners": { "steward": "The railway or owner of each locomotive; the railway safety authority oversees operation.", "master_systems": [ "Railway equipment registers" ] }, "visual_identification": [ "Long hood-unit body with a cab at one end and six axles on two trucks.", "Radiator section and fans at the rear of the long hood.", "Road numbers and builder's plates settle the individual unit." ], "failure_modes_and_hazards": [ "Collision and crushing risks around moving locomotives.", "Exhaust emissions from older diesel engines.", "Fire from fuel or electrical faults." ], "standards_and_regulation": [ "Railroad Locomotive Safety Standards, 49 CFR Part 229, US Federal Railroad Administration." ], "what_it_is_for": [ "This six-axle diesel-electric locomotive model is encountered in North American freight service, railway yards and locomotive maintenance facilities.", "It supplies traction for freight trains and can operate with other locomotives under coordinated control.", "Surviving examples may have substantial rebuilds or equipment changes, so operating and maintenance decisions depend on the individual locomotive's records." ] }, "sources": [ { "id": "wikidata", "title": "Wikidata item Q1189477: EMD SD40-2", "url": "https://www.wikidata.org/wiki/Q1189477", "url_status": "live", "what_it_supports": "identity and sense of the item", "checked_by": "wikidata-api" }, { "id": "wikipedia-en", "title": "Wikipedia: EMD SD40-2", "url": "https://en.wikipedia.org/wiki/EMD_SD40-2", "url_status": "live", "what_it_supports": "general description of the item", "checked_by": "wikidata-api sitelink" } ], "structure": { "bundles": [ { "id": "design-identity-and-lineage", "name": "Design identity and lineage", "description": "Establish whether the SD40-2 designation applies and which configuration evidence governs.", "rationale": "Related designs and rebuilt locomotives can share appearance or equipment without sharing original model identity.", "layers": [ { "id": "builder-identity", "name": "Builder identity", "description": "Resolve model identity through manufacturing and technical records.", "findings": [ { "id": "sd40-2-identification-evidence", "name": "SD40-2 identification evidence", "description": "Recognition must connect the claimed model to authoritative identification evidence.", "questions": [ { "text": "Which builder plate, serial record, or original equipment document identifies the locomotive as an SD40-2?", "kind": "provenance", "id": "sd40-2-identification-evidence-q01" }, { "text": "Which evidence distinguishes this identity from SD40, SD38-2, or SD40T-2 despite similar appearance or equipment?", "kind": "boundary", "id": "sd40-2-identification-evidence-q02" } ] } ] }, { "id": "configuration-lineage", "name": "Configuration lineage", "description": "Separate original design attributes from later modifications and variant designations.", "findings": [ { "id": "original-and-current-designations", "name": "Original and current designations", "description": "Retain the original model and documented rebuild identity as distinct claims.", "questions": [ { "text": "Which build order and modification records establish the applicable SD40-2 configuration?", "kind": "provenance", "id": "original-and-current-designations-q01" }, { "text": "Does a changed designation represent an SD40-2 modification, a separately registered derivative, or a different original locomotive rebuilt to similar specifications?", "kind": "boundary", "id": "original-and-current-designations-q02" } ] } ] } ] }, { "id": "diesel-electric-power-chain", "name": "Diesel-electric power chain", "description": "Connect prime mover configuration to electrical generation and wheel-driving equipment.", "rationale": "An SD40-2's power rating alone cannot establish its installed traction system or available performance.", "layers": [ { "id": "prime-mover-and-support-systems", "name": "Prime mover and support systems", "description": "Identify the engine and its fuel, lubrication, air, and cooling dependencies.", "findings": [ { "id": "engine-configuration-and-rating", "name": "Engine configuration and rating", "description": "Record the applicable engine specification and distinguish nominal rating from present capability.", "questions": [ { "text": "Does the installed engine match the documented SD40-2 build specification, and what replacements or deratings are recorded?", "kind": "provenance", "id": "engine-configuration-and-rating-q01" }, { "text": "What power rating and operating limits apply to that engine configuration, and on what measurement basis?", "kind": "measurement", "id": "engine-configuration-and-rating-q02" } ] } ] }, { "id": "generation-and-traction", "name": "Generation and traction", "description": "Identify electrical conversion equipment and its connection to the powered axles.", "findings": [ { "id": "installed-traction-chain", "name": "Installed traction chain", "description": "Treat generating equipment, traction motors, and gearing as a documented combination.", "questions": [ { "text": "Which generating equipment, rectifiers, traction motors, and gear ratios are installed?", "kind": "definition", "id": "installed-traction-chain-q01" }, { "text": "What continuous-current, thermal, speed, and tractive-effort limits are documented for that combination?", "kind": "measurement", "id": "installed-traction-chain-q02" }, { "text": "What restrictions follow from a traction motor cutout or a recorded electrical defect?", "kind": "action", "id": "installed-traction-chain-q03" } ] } ] } ] }, { "id": "running-gear-and-route-fit", "name": "Running gear and route fit", "description": "Assess the relationship between the SD40-2 configuration and the infrastructure supporting its movement.", "rationale": "Axle arrangement does not by itself establish truck design, route compatibility, or permissible speed.", "layers": [ { "id": "trucks-wheelsets-and-loading", "name": "Trucks, wheelsets, and loading", "description": "Resolve the installed running gear and its physical condition.", "findings": [ { "id": "running-gear-configuration", "name": "Running gear configuration", "description": "Record actual truck and wheelset equipment rather than deriving it from the model label.", "questions": [ { "text": "Which truck design, wheelsets, bearings, and suspension components belong to this build or documented modification?", "kind": "provenance", "id": "running-gear-configuration-q01" }, { "text": "What wheel dimensions, axle loads, and inspection results establish the current running-gear condition?", "kind": "measurement", "id": "running-gear-configuration-q02" } ] } ] }, { "id": "movement-envelope", "name": "Movement envelope", "description": "Connect geometry and loading to route and movement requirements.", "findings": [ { "id": "configuration-specific-route-fit", "name": "Configuration-specific route fit", "description": "Require dimensions and limits applicable to the locomotive configuration being assessed.", "questions": [ { "text": "What documented dimensions, gauge, operating mass, and curve limits apply, including external modifications?", "kind": "measurement", "id": "configuration-specific-route-fit-q01" }, { "text": "Does the proposed route accommodate that envelope, axle loading, and permitted movement speed?", "kind": "action", "id": "configuration-specific-route-fit-q02" } ] } ] } ] }, { "id": "controls-braking-and-consist-integration", "name": "Controls, braking, and consist integration", "description": "Establish which control and braking functions are fitted, available, and compatible with the intended consist.", "rationale": "Original control arrangements and later retrofits affect how an SD40-2 can operate alone or with other locomotives.", "layers": [ { "id": "traction-controls-and-protection", "name": "Traction controls and protection", "description": "Identify control architecture, operating modes, and protective responses.", "findings": [ { "id": "control-configuration-and-state", "name": "Control configuration and state", "description": "Tie mode interpretation and fault response to the installed control system.", "questions": [ { "text": "Does the locomotive retain its documented Dash-2 control equipment or use a specified replacement system?", "kind": "provenance", "id": "control-configuration-and-state-q01" }, { "text": "How does the applicable manual define run, isolation, shutdown, and protective-trip states?", "kind": "definition", "id": "control-configuration-and-state-q02" }, { "text": "Which recorded protective trips or disabled safeguards require restriction or technical assessment before operation?", "kind": "action", "id": "control-configuration-and-state-q03" } ] } ] }, { "id": "braking-and-multiple-unit-interfaces", "name": "Braking and multiple-unit interfaces", "description": "Assess fitted braking functions and lead, trailing, or towing compatibility.", "findings": [ { "id": "brake-and-consist-capability", "name": "Brake and consist capability", "description": "Separate equipment presence, tested availability, and compatibility with the intended operating role.", "questions": [ { "text": "Which air-brake system, dynamic-brake equipment, and multiple-unit interfaces are fitted and serviceable?", "kind": "definition", "id": "brake-and-consist-capability-q01" }, { "text": "What documented compatibility checks and brake tests are required for lead, trailing, and dead-in-tow roles?", "kind": "action", "id": "brake-and-consist-capability-q02" }, { "text": "What braking restrictions apply when dynamic braking or another fitted function is unavailable?", "kind": "action", "id": "brake-and-consist-capability-q03" } ] } ] } ] }, { "id": "condition-maintenance-and-service-eligibility", "name": "Condition, maintenance, and service eligibility", "description": "Connect equipment condition and maintenance evidence to a specific proposed use.", "rationale": "Model identity and historical specifications cannot establish that an aging or modified SD40-2 is fit for service.", "layers": [ { "id": "condition-and-maintenance-evidence", "name": "Condition and maintenance evidence", "description": "Assess defects and consumable requirements against applicable equipment documentation.", "findings": [ { "id": "system-condition-and-unresolved-defects", "name": "System condition and unresolved defects", "description": "Organize evidence around the installed engine, cooling, electrical, running-gear, and braking systems.", "questions": [ { "text": "What inspection or test evidence addresses engine and turbocharger condition, cooling performance, electrical insulation, and running-gear wear?", "kind": "measurement", "id": "system-condition-and-unresolved-defects-q01" }, { "text": "Which fuel, lubricant, coolant, filter, and servicing specifications apply to the installed equipment?", "kind": "definition", "id": "system-condition-and-unresolved-defects-q02" }, { "text": "Which unresolved defects require repair, isolation, monitoring, or removal from service under the applicable instructions?", "kind": "action", "id": "system-condition-and-unresolved-defects-q03" } ] } ] }, { "id": "operating-eligibility", "name": "Operating eligibility", "description": "Determine whether evidence supports the proposed role in the relevant jurisdiction.", "findings": [ { "id": "evidence-based-service-decision", "name": "Evidence-based service decision", "description": "A service decision must name its operating context and the evidence supporting it.", "questions": [ { "text": "Which issuing bodies and operator documents establish applicable inspection, emissions, braking, and train-protection requirements for this configuration and use?", "kind": "provenance", "id": "evidence-based-service-decision-q01" }, { "text": "What current records demonstrate compliance, completed maintenance, and closure of service-limiting defects?", "kind": "provenance", "id": "evidence-based-service-decision-q02" }, { "text": "Does that evidence support the proposed operating role, restricted movement, or continued withdrawal from service?", "kind": "action", "id": "evidence-based-service-decision-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": [ "This is recalled knowledge; no sources were consulted.", "Weight, gearing, maximum speed, fuel capacity and braking equipment vary by railroad specification and subsequent rebuilding.", "A locomotive described as an SD40-2 may be an original production unit or a rebuild to similar specifications; verify its builder's record before assigning production history." ], "questions": [ { "id": "evidence-confidence-notes-q01", "text": "Which of these check these first hold for the sense of EMD SD40-2 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": [ "Low short-hood configuration", "High short-hood configuration", "Extended short-hood configuration, commonly called a snoot" ], "questions": [ { "id": "evidence-kinds-q01", "text": "Which of these kinds and varieties hold for the sense of EMD SD40-2 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": "EMD locomotive model designation", "value_or_pattern": "SD40-2", "note": "Identifies the locomotive model, not an individual locomotive." }, { "scheme": "AAR wheel arrangement", "value_or_pattern": "C-C", "note": "Two three-axle trucks, with all six axles powered." }, { "scheme": "Railroad reporting mark and locomotive road number", "value_or_pattern": "Railroad reporting mark followed by an assigned number", "note": "Identifies a locomotive within an operator's fleet; ownership changes and renumbering can alter this identifier." } ], "questions": [ { "id": "evidence-identifiers-q01", "text": "Which of these identifiers and schemes hold for the sense of EMD SD40-2 this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-standards-and-regulation", "name": "Standards and regulation", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ "United States Federal Railroad Administration: 49 CFR Part 229, Railroad Locomotive Safety Standards." ], "questions": [ { "id": "evidence-standards-and-regulation-q01", "text": "Which of these standards and regulation hold for the sense of EMD SD40-2 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": [ "Mainline freight haulage", "Heavy freight operation in multiple-unit locomotive consists", "Local freight and branch-line service", "Yard transfer and switching service" ], "questions": [ { "id": "evidence-real-world-use-q01", "text": "Which of these real-world use hold for the sense of EMD SD40-2 this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-measurements", "name": "Typical measurements", "description": "Recalled without web access and unsourced; every item is a lead to verify.", "evidence": [ { "quantity": "Nominal diesel engine power", "typical_range": "3,000", "unit": "hp" }, { "quantity": "Diesel engine cylinder count", "typical_range": "16", "unit": "cylinders" }, { "quantity": "Powered axle count", "typical_range": "6", "unit": "axles" }, { "quantity": "Standard track gauge", "typical_range": "1,435", "unit": "mm" } ], "questions": [ { "id": "evidence-measurements-q01", "text": "Which of these typical measurements hold for the sense of EMD SD40-2 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": [ "Cooling-system faults can cause engine overheating and shutdown.", "Traction-motor or generator insulation failure can cause loss of propulsion, electrical arcing or fire.", "Fuel or lubricating-oil leaks near hot engine and exhaust components can cause fire.", "Wheel slip under high tractive demand can damage wheels and rails.", "Air-brake defects can reduce braking performance; moving locomotives also present collision and crushing hazards." ], "questions": [ { "id": "evidence-failure-modes-and-hazards-q01", "text": "Which of these failure modes and hazards hold for the sense of EMD SD40-2 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": [ "United States and Canadian fleets differed in railroad-specific equipment, numbering and operating requirements.", "Some railroads specified high short hoods or extended short hoods; these configurations do not by themselves define a separate locomotive model." ], "questions": [ { "id": "evidence-regional-variation-q01", "text": "Which of these regional variation hold for the sense of EMD SD40-2 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": "EMD SD40", "difference": "The predecessor model; the SD40-2 incorporates EMD's Dash 2 electrical system and associated design changes." }, { "name": "EMD SD38-2", "difference": "A related six-axle Dash 2 model with a lower-powered, non-turbocharged diesel engine." }, { "name": "EMD SD45-2", "difference": "A related six-axle Dash 2 model using a 20-cylinder engine rated at 3,600 horsepower." }, { "name": "EMD SD40-2W", "difference": "A separately designated Canadian variant distinguished by its wide safety cab." }, { "name": "Individual SD40-2 locomotive", "difference": "A physical unit has a builder's serial number, ownership history and maintenance condition; SD40-2 denotes the model shared by those units." } ], "questions": [ { "id": "evidence-neighbours-q01", "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of EMD SD40-2 this model covers, and on what evidence?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "Which existing Vercy world model, if any, already owns the SD40-2 concept and should receive this registry link?", "Which manufacturer manuals and build records establish the core SD40-2 specification and variation across production orders?", "How should Canadian-built configurations and suffixed derivatives relate to this entry without changing authoritative registry granularity?", "Which dimensions, tank capacities, masses, gearing options, truck designs, and braking options can be treated as reference configurations rather than universal attributes?", "Which documented failure patterns, maintenance limits, and jurisdiction-specific service requirements should be included after reviewing authoritative technical and regulatory sources?" ], "statistics": { "bundles": 6, "layers": 11, "findings": 19, "questions": 34 } }