A train was almost derailed after two teenagers placed rocks on the line.
British Transport Police officers want to find the youths who deliberately jammed open a points system by putting rocks on the track near the Syston East junction.
Pc Mike Leconte said: “The consequences of this reckless behaviour could have been devastating. Whoever did this not only risked their own lives by trespassing, but also risked the lives of passengers and rail staff by wilfully putting the rocks in the points.
“The actions also caused considerable delays between Birmingham New Street and Stansted Airport because of the resulting points failure.”
Vicki Beadle, community safety manager at Network Rail, added: “Incidents like this can have fatal consequences and cause huge amounts of disruption to passengers.
“The railway is a dangerous place for anyone who isn’t supposed to be there and placing items on the line to stop railway equipment working safely could have led to a very serious incident.”
A freight train driver noticed the youths trespassing on the line at around 3.30pm on Thursday, October 8. It’s believed they used the Wreake Valley foot crossing to get on to the line.
They’re both aged 13-15. One was white with black hair. He was wearing a black anorak and was holding a purple scooter. The other boy was black, with distinctive spiked black hair and was wearing a blue parka jacket.
Anyone with any information should call the British Transport Police on 0800 40 50 40 or text 61016 quoting MSUB/B3 of 30/10/15.