Derek "Paxman Diesel 8/Class 17" Peacock is a diesel, best known for his initial "teething" troubles.
Derek was designed by and built at Clayton Equipment Company and Beyer, Peacock & Co. in 1962 and arrived on Sodor in 1998. The Fat Controller realised Bill and Ben needed help and sent for Derek, but Derek's cooling system overheated on Gordon's Hill and BoCo had to come the rescue. The news of the rescue went through the North Western Railway's rumour mill in due course, until a confused Percy informed Bill and Ben that Derek had, of all things, 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.
Derek is rather enthusiastic about his work, but unfortunately for him his problem with his cooling system prevents him from working to his full potential. He is friends with Duck, BoCo, and Frank.
Derek is based on a BR Class 17, a Clayton and Beyer Peacock diesel electric Type 1.
Derek is painted in the British Railway's green livery with yellow warning panels. He carries the number D8.
- Kerry Shale (UK/US; coming soon)
- Hisao Egawa (Japan)
- Derek wasn't named in his appearance in "Double Teething Troubles" - only referred to as "the new diesel". It was not until the release of the merchandise when his name was revealed. Originally, he was going to be named "Paxman", but it was changed for fear it would offend the Paxman brand of diesels, or refer to celebrity Jeremy Paxman.
- The 1999 Thomas website refered to Derek as "Paxman Diesel".