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Reverend W. Awdry
BoCo is book fifty-three in the My Thomas Story Library series.
Bill and Ben find that their trucks are missing and realize it's a diesel that's taken them. They go to investigate and find that a big diesel has taken their trucks. They play a trick on the poor diesel to teach him a lesson. Edward calms the situation and Bill and Ben fetch more trucks. Bill, Ben, Edward, and BoCo the big diesel are now firm friends.
- Railway Series illustrator, Clive Spong provides illustrations for this book.
- This story is based on the second season episode, The Diseasel, with some lines taken from the third season episode, Buzz, Buzz.
- BoCo is depicted as a Co-Co on the 2008 cover. This was fixed in the 2011 version.