Four-year-old boys are often obsessed with trains. But Toby Friend, from Kent, is taking things a bit too far.
He has run away 15 times to try to catch a train at his local station near his home.
The boy has climbed his back garden fence and crossed two main roads to try to reach the station.
Toby has even managed to get on a train and tried to buy a ticket.
It's a bit worrying that he has managed to escape from his home 15 times. Don't they have locks on the doors?
His mother, Kirstie Field, told the BBC: "He just loves the train so much... he thinks he can go on his own.
She said: "He just loves adventure. We don't drive, so apart from the occasional bus, train is our only transport.
"The first time he actually managed to get on a train and asked for a ticket.
"Luckily the train guard didn't leave the station, but there's always that worry that he's going to get on a train and not ask for a ticket, and just go and sit down, and the train just leaves as normal."
His parents have now asked railway staff to put up warning posters to stop him getting into too much trouble.
This would surely be a bit of a concern in itself - it's a bit of an open invitation to anyone who might want to walk off with a small boy.
However, railway staff at stations all the way along the line from Tonbridge to Ashford have been given pictures of Toby so they can keep an eye out for him in case he tries to get on a train again.
If I was his mother, I'd also invest in some top quality bolts for my doors - and eyes in the back of my head...