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This article is about 'the Story Library book'. You may be looking for 'the character or the magazine story'.
"It's not fair! Peter Sam gets a new funnel, Sir Handel gets special wheels, passengers get ice lollies, but I'm not even polished!"
— Duncan

Duncan is the eighteenth book in the My Thomas Story Library series.


Duncan moans about not being polished and refuses to take passengers. That night, Skarloey tells him a story about Rheneas who always put his passengers first. Duncan promises from then on to always put his passengers first.




  • Peter Sam has his old funnel.
  • In the fourth illustration and on the 2011 cover, Duncan is missing his number.
  • Throughout the book, Duncan's cab handles disappear and reappear.
  • Throughout the book, Duncan is missing his whistle.
  • The viaduct is not to scale.