Derek is a diesel engine with bad "teething" troubles. He works at Anopha Quarry.
Bio
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Sir Topham Hatt decided that Bill and Ben needed help at Anopha Quarry. He bought Derek to his railway; unfortunately, Derek overheated when he came to a hill.
BoCo soon came to Derek's rescue.
Percy teased Bill and Ben about Derek having a toothache. The next morning; Derek came to help the twins with a train of trucks.
Unfortunately, Derek soon overheated when he came to a hill he didn't expect. He soon stopped; leaving Bill and Ben having to pull the train and Derek at the same time.
Derek is a friendly diesel engine with bad teething troubles. He overheats every time he comes to a hill; he is often found working at Anopha Quarry with Bill and Ben.
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