Published Wednesday, 18 April 2012
The train driver was injured but able to continue with his journey. (© Pacemaker)
Police are investigating Tuesday night's incident, which happened at about 8.20pm at Bells Lane in Lambeg.
The Irish Rail driver of the Belfast to Dublin Enterprise service sustained a minor injury to his eye, but was able to complete his journey to Dublin.
Seventeen passengers were onboard the train at the time.
Paul Givan, DUP MLA for Lagan Valley, has condemned the incident.
"This was an utterly wreckless act that could have caused serious injury or even mutiple deaths.
"It is incomprehensible why someone would do this and I appeal to anyone with information to contact the police. If this individual is caught the courts should administer the most severe punishment possible."
Lisburn Area Commander Chief Inspector Darrin Jones said:"This was an unbelievably stupid and dangerous act. Not only was the life of the driver placed in jeopardy, but also those of the passengers."
"The individuals who dropped that brick need to consider what could have happened had the driver been seriously hurt or if they had caused a tragedy, how would that feel?"
Officers are urging anyone who knows the identity of those involved to contact them on 0845 600 8000.
© UTV News