Parents have been warned to make sure their children know about the deadly dangers of playing on or near the railway.
British Transport Police (BTP) put out the call as numbers of trespass incidents tend to rise with a combination of the lighter nights and the Easter holidays.
Incidents include trespass, stone throwing, vandalism and obstructions being placed in front of trains.
In addition to causing avoidable disruption and delays to train services, those engaging in such behaviour can put themselves, passengers and those working on the network in danger.
Chief Superintendent John McBride said: “Anyone who indulges in these stupid criminal activities on or near the railway put themselves in great danger as well as the lives of staff working on the rail network and passengers travelling on trains.
“I am urging youngsters to stay away from the lines and asking all parents to emphasise the dangers. If you live near a railway line, please ask yourself if you know where your children are playing.”
Mark Henderson, Network Rail community safety manager, said: “Trespassing is extremely dangerous and can have tragic consequences for those involved.
“Trains take a long time to stop and anyone struck by one is likely to be killed.
“There are 25,000 volts passing through overhead power lines – enough to kill.
“Trespassers don’t even need to touch the cables to be electrocuted as electricity can jump from the cables to nearby objects.
“Anyone who has concerns about specific locations where they know trespassers are gaining access to the railway can report them to our national helpline 24-hours-a-day on 08457 114141.”