The driver of a freight train was wounded on Sunday when a bomb left on a railway track in south-eastern Turkey was detonated as the train came past, security sources said, blaming Kurdish militants for the explosion.
The train's locomotive was damaged in the incident near the town of Saray in Van province, near the Iranian border, the sources said.
There were no immediate claims of responsibility.
The Kurdistan Workers Party (PKK), which has waged a three-decade insurgency against Turkish forces, has previously attacked railroads, pipelines and other targets it considers as Turkey's strategic assets.
Four PKK militants were killed in clashes elsewhere in the mainly Kurdish region, the security sources said on condition of anonymity.