And in Turkey's worst recent rail disaster, 41 people were killed and 80 injured in July 2004 when a high-speed train derailed in the northwestern province of Sakarya.
Investigators believe heavy rains caused the ground under the rails to collapse near Tekirdag, in the north-west of the country, according to deputy prime minster Recep Akdag.
State news agency Anadolu said five wagons came off the tracks as a result of the incident on Sunday in a region near the Greek border.
The train was heading to Istanbul, with 362 passengers and six crew members.
Before then, an unnamed survivor told the private DHA news agency she had been in one of the cars that went off the tracks.
Junior health minister Eyup Gumus put the number of fatalities at 10 and the people injured at 73 based on initial reports from the scene.
Tekirdag governor Mehmet Ceylan blamed "adverse weather conditions" for the accident, adding that the ground was muddy from heavy rain and hard for rescuers to reach. "It was a disgusting accident", DHA quoted her as saying.
Television images showed emergency personnel walking to reach the crash site.
CNN Turk has claimed that a collapsed bridge was the cause of the accident.
The train involved in Sunday's accident appears to have been a slower train on a single track railway.
Turkish authorities, including President Recep Tayyip Erdogan, have said the derailment is being fully investigated.
Emergency services, military and ambulance helicopters arrived at the scene.