Derek is a green diesel who has 'teething troubles.'
Derek arrived to help Bill and Ben. He overheated on Gordon's Hill and BoCo had to come to the rescue. he North Western Railway's rumour mill in due course, until a confused Percy informed Bill and Ben that Derek had a toothache. Bill and Ben were apprehensive of Derek as a result, but forgot their fear when Derek's cooling system overheated yet again and they had to help him home. Derek was then sent to the Works to be mended.