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The SRT said the Kaeng Khoi-Nakhon Ratchasima section reopened from 5am after crews cleared debris, repaired damaged tracks and carried out thorough inspections.
All local and ordinary train services are now operating as scheduled, officials said.
The line was closed following the collapse of a construction crane from the Thai-Chinese high-speed rail project onto a passing passenger train earlier this month, killing dozens and injuring many others in one of the country’s deadliest rail accidents in recent years.
Transport authorities said preliminary findings pointed to failures by construction staff to comply with safety procedures, including inadequate coordination with railway officials during work near active tracks.
The Transport Ministry has ordered stricter controls at construction sites, including tighter work-time restrictions and mandatory safety monitoring, and is considering action against contractors found responsible.
Officials said the resumption of services reflects confidence in the line’s safety, while stressing that stronger enforcement measures will be implemented to prevent a repeat of the tragedy.