# PHMSA Hazmat Incident I-1995090484 — METHYL MERCAPTAN — CALDWELL, TX

**Citation:** PHMSA Hazmat Incident I-1995090484  
**Type / status:** incident / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 1995-08-08  
**Published:** Not stated

Serious reporter-submitted hazardous materials transportation incident on 1995-08-08 in CALDWELL, TX.

## Document text

PHMSA hazardous materials incident report I-1995090484.
Incident date: 1995-08-08.
Location: CALDWELL, TX.
Mode: Rail.
Carrier/reporter: ATCHISON TOPEKA & SANTA FE RY.
Shipper: ATOCHEM NORTH AMERICA.
Materials: UN1064; METHYL MERCAPTAN; hazard class 2.3; 0 released.
What failed: Auxiliary Valve; Piping or Fittings; Vapor Valve.
Reported failure causes: Over-pressurized.
Reported result: Spillage, Vapor(Gas) Dispersion.
Reporter-submitted DOT Form 5800.1 data may be incomplete, corrected, supplemented, or misreported. A record, serious-incident classification, failure description, or relationship to a reporting rule is not a PHMSA causal finding, compliance determination, or finding of a violation.

## Provenance

- Official: Yes
- Source: <https://portal.phmsa.dot.gov/PDFGenerator/getPublicReport/OHMIR_5800-1-PUBLIC?INCIDENTID=eQ7p0kwYd4yuSw0PHg3geQ%3D%3D>
- Source ID: `phmsa-hazmat-incidents`
- SHA-256: `0debee9efdf74e817d6a4bc1f919d9b21835a32c4e893283bdd2714c3f7af98a`
- Retrieved: 2026-08-13T12:55:56.545Z
- Exported: 2026-08-27T10:24:56.022Z
- Document slug: `phmsa-hazmat-incident-i-1995090484`

### Source metadata

```json
{
  "materialSubtype": "phmsa_hazmat_serious_incident",
  "reportNumber": "I-1995090484",
  "operatorReported": true,
  "serious": true,
  "finalAgencyFinding": false,
  "eventDescriptionExcluded": true,
  "publicPdfUrl": "https://portal.phmsa.dot.gov/PDFGenerator/getPublicReport/OHMIR_5800-1-PUBLIC?INCIDENTID=eQ7p0kwYd4yuSw0PHg3geQ%3D%3D",
  "rowCount": 1,
  "carrierReporterNames": [
    "ATCHISON TOPEKA & SANTA FE RY"
  ],
  "shipperNames": [
    "ATOCHEM NORTH AMERICA"
  ],
  "routes": [
    "12TH STREET AT TRACKS"
  ],
  "cities": [
    "CALDWELL"
  ],
  "states": [
    "TX"
  ],
  "originCities": [],
  "modes": [
    "Rail"
  ],
  "materials": [
    {
      "identificationNumber": "UN1064",
      "commodityName": "METHYL MERCAPTAN",
      "hazardousClass": "2.3",
      "quantityReleased": "0",
      "unitOfMeasure": null
    }
  ],
  "packages": [
    {
      "identificationMarkings": null,
      "outerMaterial": null,
      "outerType": null,
      "outerCapacity": "24976",
      "outerCapacityUnit": "LGA",
      "outerShipmentCount": "1",
      "outerFailedCount": "1",
      "innerMaterial": null,
      "innerType": null,
      "innerCapacity": "0",
      "innerCapacityUnit": null,
      "innerShipmentCount": "0",
      "innerFailedCount": "0"
    }
  ],
  "reportingRuleContext": [
    "171.15",
    "171.16"
  ],
  "caveat": "Reporter-submitted DOT Form 5800.1 data may be incomplete, corrected, supplemented, or misreported. A record, serious-incident classification, failure description, or relationship to a reporting rule is not a PHMSA causal finding, compliance determination, or finding of a violation.",
  "privacyCaveat": "The public CSV excludes preparer contact fields. Event Description is intentionally excluded from normalized records and search output to reduce incidental personal-information risk.",
  "jurisdiction": "US"
}
```