Dennis is a lazy Diesel.
When Dennis was new to the railway, he tried to take advantage of Thomas. He soon learnt his lesson when he reversed into a ditch. With Thomas' help he was able to finish his work and promised to be a Really Useful Engine from now on.
Dennis is considered to be a very lazy Diesel who tries to take advantage of others and depend on them to do his work. Dennis will always create excuses to get out of work, but usually gets caught in his lies, and is always very sorry - until he finds another opportunity to get out of work again.
Dennis is based on No. 11001, a Bulleid Diesel built at Ashford Works, England in 1949 and scrapped in 1959. He also carries his basis' number.
Dennis is painted light grey with dark grey wheels and roof and a red bufferbeam.
- Tsutomu Densaka (Japan)