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The Ultimate Diesel Guide is a booklet about the Diesels on the Island of Sodor.
- Bill and Ben
- 'Arry and Bert
- Diesel 10
- The book was given away at Day Out with Thomas events and with DVDs in the UK and US. It was also available online.
- For unknown reasons, The Diesel, Splatter and Dodge were not included.
- On the front cover, Salty's bufferbeam is not weathered.