Derek looks the part, but he sadly suffers a lot from overheating and various other teething troubles. The twins, Bill and Ben, who work the quarries and clay mines near Brendam Docks discover that as much as they dislike diesels, Derek is a kindly soul; and they feel sorry for him after he tries his best to help them.
Derek is based on British Rail's Bo-Bo diesel electric locomotive, Type 1 900 HP Clayton Class 17/1 D 8500 series of which one example (No. D8568) is a sole survivor.
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