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A campaign has been launched to highlight to young people the dangers of trespassing on the high speed railway line running through Kent.

A special 12-minute DVD, part of Network Rail's 'No Messin'' campaign, will be shown to youngsters in more than 300 schools and youth groups in Kent, Essex and Greater London, in an effort to keep them away from the tracks.

Trains on the line between the Channel Tunnel at Cheriton, near Folkestone and St Pancras in central London can reach speeds of up to 186mph, over twice the speed of most domestic rail services in the region.

• Watch a trailer for the DVD above.

Anne-Marie Batson, community safety manager at Network Rail, said: "It is madness for young people to play on any railway line, but owing to the fact the high-speed trains are bigger, faster and quieter, we have developed this initiative to highlight some of the specific dangers associated with them.

"We hope that by getting these messages across we can help prevent a needless tragedy."

Ben Ruse from High Speed 1, which owns this stretch of railway, said: "In an environment where you have a unique combination of 800-tonne trains doing over 80 metres per second with power lines that are carrying 25,000 volts, there would be no chance of survival if you come into contact with either of them.

"You might as well play football on the motorway."

In 2008, Network Rail received 935 reports of people putting their lives on the line by trespassing on Kent’s tracks.

So far there have been few incidents on the High Speed 1 line, which Eurostar trains travel on at up to 186mph – more than double the speed of regular rail services.

But with new “bullet” trains to the capital set to use it as well from as early as the summer, transport bosses are going to play a hard-hitting DVD called No Messin’ to children at hundreds of schools and youth groups across Kent to keep them away.

It uses watermelons to represent a person’s head being crushed by a train, shows how stones can kill passengers and electricity can jump from the lines.

And it delivers the thought-provoking message: “If you get hit by a high-speed train, we won’t need a stretcher – just a body bag.”

Pupils at Swan Valley Community School in Swanscombe, near Ebbsfleet International Station, worked with Network Rail to create the DVD.

Assistant head teacher Paul Hodson said: “You could have heard a pin drop when our students watched it.”

Ch Supt Mark Newton, from BTP, said: “The simple message is that the railway is not a playground. If you play around on these lines, be prepared to pay the ultimate price.

“Trespassing on or interfering with the railway is extremely dangerous and you could end up with a criminal record as a result. However, the greatest deterrent should be the fact that you could be seriously injured or even lose your life.”

Ben Ruse from High Speed 1, which owns this stretch of railway, added: “These trains are very difficult to stop quickly even if a driver slams on the brakes immediately.”