Dennis is a fictional standard gauge diesel shunter created by Sharon Miller working on the North Western Railway. In 2005, Dennis made his debut in the ninth series of Thomas & Friends in the episode, Thomas' Day Off. He last appeared in the special, The Great Discovery. Dennis has not appeared in the television series since 2008. Dennis is based on British Railways No. 11001. Production orthographics were drawn up for Dennis' gauge 1 model by Conrad Ayling on 13th July 2004. Dennis' model was