Mexico’s Attorney General Ernestina Godoy has confirmed that excessive speed was the primary cause of the Interoceanic Train derailment in Oaxaca on December 28, 2025. Presenting the findings of a federal investigation on January 27, Godoy stated that the train was traveling at 65 km/h in a zone limited to 50 km/h. The mechanical systems were functioning properly, ruling out technical failure as a contributing factor.
The derailment occurred on Line Z of the Interoceanic Corridor, a strategic freight and passenger rail route connecting Salina Cruz on the Pacific coast with Coatzacoalcos on the Gulf of Mexico. The corridor is one of the federal government’s flagship infrastructure projects, intended to enhance regional connectivity and economic development across southern Mexico.
According to the Attorney General’s office, the investigation involved site inspections, technical assessments of the rail infrastructure, and consultations with civil and railway engineering experts. These efforts concluded that human error—specifically, the train operator’s decision to accelerate beyond the posted speed limit—was responsible for the incident.
The findings do not address whether supervisory lapses or insufficient safety mechanisms may have contributed to the operator’s actions.
As a result, criminal proceedings have been initiated against the operator for probable negligent homicide and injuries. Godoy noted that expert analysis confirmed the train’s systems were operating correctly at the time of the accident, reinforcing the conclusion that operational conduct was at fault.
While the investigation clearly identifies excessive speed as the immediate cause, it leaves open questions about broader systemic issues. The findings do not address whether supervisory lapses or insufficient safety mechanisms may have contributed to the operator’s actions. Nor does the report clarify whether automated controls or additional safeguards could have prevented the derailment.
The incident has drawn renewed attention to safety protocols on newly inaugurated or rehabilitated rail lines. As Mexico continues to invest in large-scale infrastructure projects like the Interoceanic Corridor, scrutiny is likely to intensify over how these systems are managed and monitored in practice.
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