Police are hunting vandals who hurled bricks at trains travelling to Halifax.
Three trains were damaged by the vandals over the Bank Holiday weekend.
Two of the trains were travelling towards Halifax and all of the incidents happened as Northern Rail trains passed Dalcorss Grove footbridge in Bradford.
The first incident happened on Sunday when an object, believed to be a brick, was thrown from the footbridge at the 1.12pm hours Leeds to Halifax service. The front of the train, where the destination location is displayed, was smashed and damaged.
PC John Moses, from British Transport Police, said: “Approximately 30 minutes later the 1.54pm Leeds to Manchester Victoria service travelling through the area also had what is believed to be a brick thrown at it, causing the windscreen to smash.
“Fortunately, neither incident saw anyone injured, but the second train did have to be taken out of service.”
“On Monday, an object was thrown from the same location, smashing a window on the 3.39pm Wakefield to Leeds service. No one was injured.
“Whoever was responsible for this foolish and dangerous act put the lives of rail passengers and staff at risk.
“We urge those who think that throwing objects at trains on the railway is fun to think about the consequences of their actions, which could result in serious injury or someone being killed.
“Officers will be stepping up patrols in the area to try and catch those responsible and will also be conducting local inquiries into the incident. We ask for anyone with any information that could help our investigation to come forward.”
Richard Allan, area director for Northern Rail added: “An incident such as a brick striking the window of a train can cause serious shock and upset, and potential physical injury to our drivers and conductors, and as a result, our passengers can suffer long and unnecessary delays and disruption to their journey.
“This particular damaged window meant the train had to be taken out of service for repair causing needless delays and disruptions to passengers, something that is preventable and can be avoided.
“These destructive acts of vandalism are putting the safety of our employees and passengers at risk. I would urge anyone with information on these incidents to contact the British Transport Police immediately before someone is seriously injured.”
Anyone with any information about the incident should contact British Transport Police on 0800 405040 quoting 236 26/8/12 or the independent charity, Crimestoppers, anonymously on 0800 555111.