{
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 "constitutionVersion": "1.0.0",
 "createdAt": "2026-08-12T00:00:00Z",
 "description": "Append-only Evidence Passport records. Old revisions are immutable; corrections create a new revision and preserve the previous permalink.",
 "entity": {
  "type": "project",
  "id": "vancouver-skytrain-automation",
  "title": "SkyTrain Automated Rapid Transit Network",
  "canonicalUrl": "https://1001smartcities.org/projects/vancouver-skytrain-automation/"
 },
 "currentRevisionId": "2026-10-14-baseline",
 "revisions": [
  {
   "id": "2026-10-14-baseline",
   "createdAt": "2026-10-14T06:09:48Z",
   "effectiveAt": "2026-10-14",
   "changeType": "baseline",
   "summary": "Created the first structured Evidence Passport with 11 claims and 5 source dossiers.",
   "preparedBy": {
    "type": "automation",
    "label": "AI-assisted evidence preparation",
    "humanApproved": false
   },
   "review": {
    "status": "unreviewed",
    "by": null,
    "date": null,
    "note": "Awaiting operator and domain-expert review; publication of this revision implies neither."
   },
   "changes": [
    {
     "operation": "add",
     "path": "/evidencePassport",
     "summary": "Added claim-level evidence mapping and source dossiers."
    },
    {
     "operation": "add",
     "path": "/revisionHistory",
     "summary": "Established a permanent, hash-addressed baseline revision."
    }
   ],
   "snapshotHash": "sha256:fcb3672230d2eca73ab41cce896d2aeaab0510a18180df7cd974ff21d3dc94bb",
   "snapshot": {
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    "assurance": {
     "status": "unreviewed",
     "scope": "evidence-passport-revision",
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     "machineChecks": [
      "schema",
      "publication-diff-contract",
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      "claim-text-drift",
      "source-reference-resolution",
      "complete-source-dossier",
      "snapshot-hash"
     ]
    },
    "projectState": {
     "status": "live",
     "outcome": "ongoing",
     "evidenceGrade": "official",
     "timeline": {
      "started": 1985,
      "ended": null
     }
    },
    "governance": {
     "operator": "TransLink, via BC Rapid Transit Company (Expo & Millennium Lines) and ProTrans BC (Canada Line, P3 concession)",
     "actorTypes": [
      "regional-government",
      "private"
     ],
     "fundingModel": "mixed",
     "fundingDescription": "Provincial and regional government capital funding for Expo/Millennium; Canada Line built as a federal-provincial-local public-private partnership",
     "cost": null,
     "ownership": null,
     "decisionRights": null,
     "exitConditions": null
    },
    "claims": [
     {
      "id": "clm-042a352bbd24f49b",
      "field": "snippet",
      "text": "SkyTrain has run driverless since opening in December 1985",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
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      ],
      "supportNote": "TransLink: driverless trains for four decades; Wikipedia: limited fare-free service began 11 December 1985.",
      "caveat": "Revenue service began on 3 January 1986.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
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     {
      "id": "clm-c31ea8277d1d2e39",
      "field": "snippet",
      "text": "roving SkyTrain attendants can drive a train manually if needed",
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      "mappingStatus": "mapped",
      "sourceRefs": [
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      ],
      "supportNote": "Wikipedia: SkyTrain attendants provide first aid and customer service, monitor train faults and operate the trains manually if necessary.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     {
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      "field": "snippet",
      "text": "Its signalling, the forerunner of Thales' SelTrac, runs all three lines",
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      "mappingStatus": "mapped",
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      "supportNote": "Wikipedia: the signalling used on all three lines was originally developed by Alcatel and later provided the basis of SelTrac, now maintained and sold by Thales.",
      "caveat": null,
      "interpretation": {
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     {
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      "field": "snippet",
      "text": "the Canada Line uses different Hyundai Rotem trains, also fully automated",
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       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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      "field": "snippet",
      "text": "The Expo and Millennium Lines averaged nearly 349,000 weekday boardings in 2024",
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      "supportNote": "TransLink (December 2025): last year the Expo and Millennium lines averaged nearly 349,000 weekday boardings.",
      "caveat": "Excludes the Canada Line.",
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     {
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      "field": "snippet",
      "text": "A 2022 derailment near Scott Road was traced to a worn, poorly installed bolt connection at a switch",
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      "mappingStatus": "mapped",
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      "supportNote": "The operator's September 2022 investigation named worn lateral surfaces and elongated bolt holes at a bolt connection, combined with poor bolt installation, as the root cause.",
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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      "field": "impact",
      "text": "BC Rapid Transit Company, which runs the Expo and Millennium Lines, gives an on-time service delivery rating of 96.5%",
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      "mappingStatus": "mapped",
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      "supportNote": "The operator page states an on-time service delivery performance rating of 96.5%.",
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
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      "field": "impact",
      "text": "the operator's own figure, published without its method",
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      "supportNote": "The page gives the rating without a period or a definition of on time.",
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     {
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      "field": "lesson",
      "text": "Automation does not remove the maintenance burden",
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      "mappingStatus": "mapped",
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      "supportNote": "The derailment report traces the failure to maintenance and inspection, not to the train control system.",
      "caveat": null,
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       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
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     {
      "id": "clm-b758b64626d0b217",
      "field": "lesson",
      "text": "the 2022 derailment came from a switch installed in 1989 that was overdue for inspection and replacement",
      "statementKind": "quantitative",
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      "mappingStatus": "mapped",
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      "supportNote": "The 1989-installed switch had been scheduled for replacement in the first quarter of 2021; inspections on 28 and 29 May 2022 did not capture the bolt condition.",
      "caveat": null,
      "interpretation": {
       "added": false,
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     {
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      "field": "lesson",
      "text": "while the guideway department carried 3,092 open work orders",
      "statementKind": "quantitative",
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      "mappingStatus": "mapped",
      "sourceRefs": [
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       "added": false,
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     {
      "id": "src-a1f4e22217067a4d",
      "title": "TransLink — SkyTrain Marks 40 Years",
      "url": "https://www.translink.ca/news/2025/december/from%20expo%2086%20to%20everyday%20essential%20skytrain%20marks%2040%20years",
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       "publishedAt": "2025-12-11",
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       "dossierCreatedAt": "2026-10-14",
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      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "TransLink release for SkyTrain's 40th anniversary: driverless trains for four decades; the Expo and Millennium lines averaged nearly 349,000 weekday boardings last year; calls SkyTrain at Expo 86 the world's first fully automated driverless rapid transit system.",
       "exact": false
      },
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     },
     {
      "id": "src-05b0b00604aa3860",
      "title": "TransLink — British Columbia Rapid Transit Company",
      "url": "https://www.translink.ca/about-us/about-translink/operating-companies/british-columbia-rapid-transit-company",
      "publisher": {
       "name": null,
       "domain": "translink.ca",
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      "sourceType": "web-page",
      "language": "und",
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      "claimRefs": [
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      "locator": {
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       "value": "Operator page for the Expo and Millennium Lines: about 350,000 passengers per weekday and an on-time service delivery performance rating of 96.5%.",
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      "id": "src-e2395b2cf4230d18",
      "title": "Wikipedia — SkyTrain (Vancouver)",
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       "classification": "not-classified"
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       "recordLastVerifiedAt": "2026-10-14",
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       "retrievedAt": null,
       "status": "record-date-only"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "Encyclopaedia: limited fare-free service from 11 December 1985, revenue service from 3 January 1986; signalling originally by Alcatel, later the basis of Thales' SelTrac, used on all three lines; Canada Line trains by Hyundai Rotem, fully automated; SkyTrain attendants can operate trains manually.",
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      },
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       "contentHash": null,
       "status": "not-captured"
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     {
      "id": "src-79c2a5914fb70470",
      "title": "Business in Vancouver — Surrey derailment investigation",
      "url": "https://www.biv.com/news/transportation/surrey-skytrain-derailment-investigation-points-neglect-deficient-quality-control-8272325",
      "publisher": {
       "name": null,
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       "classification": "not-classified"
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      "language": "und",
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      "temporal": {
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       "retrievedAt": null,
       "status": "record-date-only"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "Reports the operator's internal investigation of the May 2022 derailment near Scott Road: neglect and deficient quality control.",
       "exact": false
      },
      "preservation": {
       "archiveUrl": null,
       "archivedAt": null,
       "contentHash": null,
       "status": "not-captured"
      }
     },
     {
      "id": "src-322ce6726017e829",
      "title": "theBreaker — SkyTrain derailment investigation points to neglect (30 June 2023)",
      "url": "https://thebreaker.news/business/skytrain-derailment-report/",
      "publisher": {
       "name": null,
       "domain": "thebreaker.news",
       "classification": "not-classified"
      },
      "sourceType": "web-page",
      "language": "und",
      "role": "claim-evidence",
      "claimRefs": [
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       "clm-d47b92e2175f489e",
       "clm-b758b64626d0b217",
       "clm-045fecdc892bb6ff"
      ],
      "temporal": {
       "publishedAt": "2023-06-30",
       "updatedAt": null,
       "sourceCheckedAt": null,
       "recordLastVerifiedAt": "2026-10-14",
       "dossierCreatedAt": "2026-10-14",
       "retrievedAt": null,
       "status": "publication-and-record-dates-recorded"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "Reports the BC Rapid Transit Co. September 2022 investigation 'Derailment Investigation at Switch DC 47': root cause worn lateral surfaces and elongated bolt holes combined with poor bolt installation; the 1989 switch was overdue for replacement; 3,092 open work orders in the guideway department.",
       "exact": false
      },
      "preservation": {
       "archiveUrl": null,
       "archivedAt": null,
       "contentHash": null,
       "status": "not-captured"
      }
     }
    ],
    "coverage": {
     "claimsTotal": 11,
     "claimsMapped": 11,
     "sourcesTotal": 5,
     "sourcesUsedByClaims": 5,
     "sourcesWithPublicationDate": 2,
     "sourcesWithArchive": 0,
     "sourcesWithExactLocator": 0,
     "sourcesWithContentHash": 0
    },
    "limits": [
     "Publisher names and source languages have not yet been classified; domains are recorded without guessing.",
     "Existing source notes are descriptive locators, not page- or paragraph-exact citations.",
     "A missing archive, publication date or content hash is shown as null rather than inferred.",
     "The project-level evidence grade ranks the strongest source in the entry; it is not a truth score for every claim."
    ]
   }
  }
 ]
}