Investigators looking into the cause of the train crash in Turkey’s Tekirdag Province which killed 24 people on Sunday have suggested that a culvert collapse triggered the derailment.
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The incident, which injured 73 people, caused six carriages on the service from Istanbul to Erdine to overturn.
The transport ministry said that the train, carrying 362 passengers, had derailed as recent heavy downpours caused the ground beneath the track to erode away.
Images released from the crash site show a collapsed culvert retaining wall and embankment with the track suspended in mid-air.
After reviewing local media reports, landslide specialist Dave Petley, who is also pro-vice-chancellor (research and innovation) at the University of Sheffield, said: “The remarkable thing about this tragedy is that it was caused by such a small geotechnical failure. In total the amount of ground that has shifted is probably a few cubic metres. Landslide-induced rail accidents are not unusual; this accident illustrates the need for vigilance in the management of earthworks on the rail network.”