There were immediate no claims of responsibility and officials named any suspects. Kurdish separatist groups have said they were behind the two other attacks.
Five wagons in the train, which was also carrying passengers and freight, came off the tracks after a bomb planted earlier was detonated by remote control, security sources said.
The train was travelling between the eastern towns of Elazig and Mus, and the attack occurred in the same stretch where a bomb hit a train on July 2, killing six security guards.
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