L'agence fédérale associe le déraillement du train au Québec en décembre aux variations de température .

A federal transportation safety agency has linked a December freight train derailment in northern Quebec to extreme temperature fluctuations, according to a recent report. The incident occurred on December 28 near Sept-Îles, approximately 60 kilometers north of the city on Quebec's North Shore. The derailment involved a freight train carrying iron ore, which derailed after an automatic emergency brake was activated. While 29 railcars and one locomotive were affected, no injuries were reported, and most of the spilled iron ore did not reach the frozen surface of the nearby Nipissis River. The Transportation Safety Board of Canada stated it could not definitively identify the exact cause of the derailment. However, it suggested that a broken rail likely contributed to the incident. The board noted that the rail failure may have been influenced by the stress caused by sharp temperature changes and the prior passage of another train with a defective wheel. This analysis comes amid broader concerns about rail infrastructure reliability, particularly following a record number of broken-rail incidents in 2025. According to the report, the rail line in question, which was installed in 2022, had been inspected just three days before the derailation. Inspectors found no defects during this check. Despite these findings, the frequency of broken rails remained high, with 47 such incidents recorded throughout the year. More than half of these occurrences took place in January and December, highlighting a seasonal pattern that may be tied to environmental conditions affecting the tracks. The derailment prompted local authorities to implement a temporary confinement order on Montreal’s south shore, restricting access to certain areas as part of ongoing safety measures. Emergency services responded swiftly to the incident, ensuring that no passengers or crew members were harmed. The spilled cargo, primarily iron ore, posed minimal environmental risk due to the frozen state of the adjacent river. Rail operators and maintenance teams continue to investigate the root causes behind the recurring rail failures. Officials emphasize the need for enhanced monitoring and inspection protocols, especially during periods of extreme weather. The Transportation Safety Board is currently reviewing its procedures to better anticipate and mitigate risks associated with thermal expansion and contraction of railway tracks. Looking ahead, the agency plans to release further recommendations based on its findings. These may include updated maintenance schedules, improved materials for rail construction, and advanced monitoring systems capable of detecting early signs of structural stress. Meanwhile, rail companies are being urged to collaborate with regulatory bodies to ensure safer operations during fluctuating temperatures. As winter approaches, vigilance will remain critical in preventing similar incidents in the future.