{
  "reviewedOn": "2026-10-08",
  "carrierPeriod": {
    "start": "2026-09-26",
    "end": "2026-10-02",
    "reportDate": "2026-10-07"
  },
  "publishedCarriers": [
    "BNSF",
    "CN",
    "CPKC",
    "CSX",
    "NS",
    "UP"
  ],
  "reportedFigureDiscrepancy": "For September 26\u2013October 2, NS reports 165,576 cars online versus a component sum of 165,574, and 15 trains held per day versus 16 from train-type totals. Cause/type subtotals also differ. Reported figures are retained without adjustment; the reason is unconfirmed.",
  "arithmeticExceptions": [
    {
      "road": "NS",
      "check": "cars categories vs total",
      "componentCells": [
        "B30",
        "B31",
        "B32",
        "B33",
        "B34",
        "B35",
        "B36",
        "B37"
      ],
      "missingCells": [],
      "sum": 165574.0,
      "reported": 165576.0,
      "difference": -2.0
    },
    {
      "road": "NS",
      "check": "held causes vs Intermodal",
      "componentCells": [
        "B51",
        "C51",
        "D51"
      ],
      "missingCells": [],
      "sum": 1.0,
      "reported": 2.0,
      "difference": -1.0
    },
    {
      "road": "NS",
      "check": "held causes vs Grain unit",
      "componentCells": [
        "B52",
        "C52",
        "D52"
      ],
      "missingCells": [],
      "sum": 0.0,
      "reported": 1.0,
      "difference": -1.0
    },
    {
      "road": "NS",
      "check": "held causes vs Automotive unit",
      "componentCells": [
        "B54",
        "C54",
        "D54"
      ],
      "missingCells": [],
      "sum": 0.0,
      "reported": 1.0,
      "difference": -1.0
    },
    {
      "road": "NS",
      "check": "held causes vs Ethanol unit",
      "componentCells": [
        "B56",
        "C56",
        "D56"
      ],
      "missingCells": [],
      "sum": 0.0,
      "reported": 1.0,
      "difference": -1.0
    },
    {
      "road": "NS",
      "check": "held train types vs crew",
      "componentCells": [
        "B51",
        "B52",
        "B53",
        "B54",
        "B55",
        "B56",
        "B57",
        "B58"
      ],
      "missingCells": [],
      "sum": 2.0,
      "reported": 3.0,
      "difference": -1.0
    },
    {
      "road": "NS",
      "check": "held train types vs locomotivepower",
      "componentCells": [
        "C51",
        "C52",
        "C53",
        "C54",
        "C55",
        "C56",
        "C57",
        "C58"
      ],
      "missingCells": [],
      "sum": 1.0,
      "reported": 2.0,
      "difference": -1.0
    },
    {
      "road": "NS",
      "check": "held train types vs other",
      "componentCells": [
        "D51",
        "D52",
        "D53",
        "D54",
        "D55",
        "D56",
        "D57",
        "D58"
      ],
      "missingCells": [],
      "sum": 9.0,
      "reported": 10.0,
      "difference": -1.0
    },
    {
      "road": "NS",
      "check": "held train types vs total",
      "componentCells": [
        "E51",
        "E52",
        "E53",
        "E54",
        "E55",
        "E56",
        "E57",
        "E58"
      ],
      "missingCells": [],
      "sum": 16.0,
      "reported": 15.0,
      "difference": 1.0
    }
  ],
  "gateway": {
    "publishedThrough": "2026-09-19",
    "existingObservationHolds": 394,
    "withheldCandidateWeeks": [
      "2026-09-20/2026-09-26",
      "2026-09-27/2026-10-03"
    ],
    "note": "Chicago Gateway coverage remains through September 19, 2026. Two newer weeks are withheld: September 20\u201326 has workbook/portal agreement but no linked matching PDF; September 27\u2013October 3 has workbook/PDF agreement but no portal corroboration in the October 8 review. The October 7 compilation revises 28 September 30 Chicago supplementary cells; 20 revised yard values match the preserved September 30 workbook, but that agreement does not settle source precedence or the Gibson/IHB Autos identity conflict. Neither candidate week nor these revisions is adopted. All 394 existing observation holds remain; gaps are not zeros and dependent changes remain unavailable."
  },
  "unchanged": "BRC operations, STB-1251, economic and quarterly freight datasets; all earlier carrier observations.",
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      "reportingPeriod": "Historical compilation through carrier week September 26-October 2 and Gateway week September 27-October 3, 2026"
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