Rail Defect Investigation Reveals Cause of October 2023 Train Derailment

A rail defect caused the October 2023 CN train derailment near Dunsinane, New Brunswick, resulting in hazardous material leakage. The Transportation Safety Board of Canada (TSB) released its report. This was reported by the railway transport news portal Railway Supply.

Key Findings on Rail Defect and Derailment Cause

The TSB’s investigation revealed the derailment occurred after a structural rail defect compromised the track. At least four railcars derailed, spilling 2000 liters of methanol.

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Detailed analysis attributed the rail defect to internal fatigue cracks, known as head checking, which weakened the structure over time. Testing with ultrasonic tools failed to detect these flaws.

Records show the rail section underwent three ultrasonic flaw detection tests in the five months preceding the accident. Despite this, none of the tests produced valid results, allowing the defect to remain unnoticed.

Impact of Rail Defect on Testing and Maintenance Practices

Investigators highlighted that ultrasonic testing reliability decreases when rail surfaces are compromised by grinding delays or weather-related conditions. Operators were not required to report these issues.

CN’s maintenance logs showed the last grinding session for the Sussex Subdivision was completed in June 2023, four months before the derailment. Grinding activities on the bridge at Mile 32.7 were canceled due to fire risks.

Missed grinding and unaddressed defects increased the risk of failure. Experts emphasized the importance of rescheduling maintenance to avoid vulnerabilities in infrastructure integrity.

Safety Recommendations to Prevent Future Rail Defects

The TSB recommended upgrading ultrasonic rail testing procedures to enhance defect detection capabilities. Regular maintenance, improved scheduling, and stricter compliance with safety standards were emphasized as priorities.

Operators were urged to enforce protocols ensuring maintenance delays are addressed quickly, minimizing future derailment risks. Advanced tools and updated practices could strengthen the reliability of flaw detection systems.

Final Thoughts on Addressing Rail Defects and Improving Safety

This report underscores the urgent need for improved rail safety measures and maintenance accountability. Operators must prioritize identifying defects early to safeguard communities and prevent hazardous incidents.

Source: www.rtands.com

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