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Daisy is the twenty-ninth book in the My Thomas Story Library series.
Daisy comes to Sodor to help on Thomas' branch line whilst Thomas is away for repairs, but she ends up having trouble with a milk tanker and a bull. Later, Percy puts the branch line through more difficulties after having an accident.
- This book is based on the stories, "Daisy", "Bull's Eyes", and "Percy's Predicament" from the Railway Series book Branch Line Engines.
- Percy's coal bunker is green.
- Daisy is depicted as having a Co-Bo wheel arrangement.