A train driver had a narrow escape when an object thrown from a bridge in Warwickshire smashed through the side window of his cabin.
The incident involving a Crosscountry service from Birmingham New Street to Cambridge occurred shortly before 21:00 BST on Sunday, according to police
A stone or brick hit the train as it passed under a footbridge close to the Arley Tunnel in Ansley.
The driver was uninjured and the service was terminated at Leicester.
A British Transport Police spokesman said: "This was a reckless act of vandalism that could easily have caused serious injury.
"We would appeal for anyone who knows anything about this incident to contact us."