There are no playgrounds or cinemas nearby. The campsite where Harry was staying has got a shower block and a shop and that's about it.
Harry was so bored he ended up throwing stones at one of the steam trains.
What is restorative justice?
One of the windows smashed causing thousands of pounds of damage and many of the people on the train were frightened.
I wanted to find out how Harry feels about it all now. But it was too wet to talk to him by the tracks so we went to shelter inside a bigger train station nearby.
Harry was really friendly and I could tell he felt guilty about the damage he caused.
He told me he'd agreed to chat to Newsround to try to stop other kids doing anything similar.
I think meeting the people who work on the train line definitely helped Harry understand why what started as a bit of fun ended up causing so many problems.
He was very embarrassed when he found out how much his actions had hurt and inconvenienced people.
Does restorative justice work?
And he told us he never wants to have that feeling again, so he's going to be avoiding getting into trouble from now on.
Harry reckons this kind of punishment works, and he would like to see more police forces using it on children.
Some people don't think it's tough enough though.
They prefer more traditional ways of dealing with kids who commit crimes, like telling them off at police stations and recording their details so other people can find out about what they did wrong, even years later.
There are definitely good and bad points about both ways of punishing children.
You can find out more about them by watching my report and reading more about this topic by clicking on the links on the right hand side of this page.
Whatever you think, I hope you'll agree that Harry is really sorry."