Harvey Price has set a world record for the longest drawing of a train.<br /><br />The son of former glamour model Katie Price, who has autism, Prader-Willi syndrome, septo-optic dysplasia and a learning disability, drew the 21.3 metre-long picture of his favourite train – a Thameslink engine and carriages.<br /><br />Mr Price, 21, is a keen artist and train enthusiast - his favourite train is the Gatwick Express.<br /><br />He began the challenge in June during Mencap’s Learning Disability Week, spending four weeks making the piece.<br /><br />Guinness World Records presented Mr Price with a certificate in front of his mother, teachers and friends.