Reports said that the train, carrying 362 passengers, had derailed as recent heavy rain caused the ground beneath the track to erode away.
The train was traveling from Uzunkopru, Edirne province, to Istanbul when it derailed near Sarilar village in Tekirdag's Corlu district, according to Anadolu.
Over 100 ambulances have been sent to the scene, state-run TRT Haber television said TRT Haber said, quoting Health Ministry Undersecretary Eyup Gumus. Local governor Mehmet Ceylan told the NTV channel that helicopters had already taken numerous injured away from the scene.
Tekirdag governor Mehmet Ceylan said the wagons were derailed due to excessive rain.
"Many of those injured have been taken off the site". Five of its six cars derailed.
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The Turkish army said in a statement that it sent helicopters to the scene, while the Istanbul municipality on Twitter said 24 rescue workers and six rescue vehicles were on their way to provide assistance. "It was a awful accident", DHA quoted her as saying.
Meanwhile, President Recep Tayyip Erdogan was informed about the mishap by Interior Minister Suleyman Soylu and Minister of Transport, Maritime Affairs and Communications Ahmet Arslan over the phone, a presidential source said.
Private news channel CNN Turk said the accident was caused by a collapsed bridge.
Television footage shows rescuers heading to the crash site, and victims pulled from the carriages. The head of Turkey's emergency and disaster services said the muddy area was hard to reach.