WARNINGS to children about the dangers of playing near railway lines should be repeated again and again, parents were told today.
During term time, railway staff regularly visit Huddersfield schools to tell children to stay away from tracks.
But those lessons are quickly forgotten during the long summer holiday.
Heidi Mottram, Arriva Trains Northern's commercial director, said: "As each week passes, children are looking for new things to do.
"Unfortunately, some children might consider fooling around near railway lines as something fun to try.
"But we want them to know the dangers and stay away."
Youngsters risk injury, death or prosecution for damage and trespass.
Ms Mottram added: "We are asking parents to take a few minutes to remind youngsters about the hazards of trespassing."
Over the past 12 months, there has been a 14% drop in trespassing by youngsters on the ATN's network over the summer holiday, since the company introduced a schools liaison officer.
A poster campaign has also reminded children to steer clear of railway lines.