Officers are appealing for witnesses after an incident of endangering the railway near Preston earlier this month.
Overnight on Saturday 5 June a paving stone was thrown from a rail over road bridge near Lostock Hall railway station just outside Preston.
The stone caused damage to nine passing trains, electrical cables and led to just shy of £20,000 in disruption costs.
Witnesses or anyone with information can contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 207 of 05/06/21.
Alternatively, you can call Crimestoppers on 0800 555 111.
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