Duke

Personality
Duke is one of the oldest and most experienced engines on the Island of Sodor.

Duke was the mentor of Peter Sam, Sir Handel and Smudger from their days on the Mid Sodor Railway. Duke has a head teacher attitude and maintains his authority at all times, but can be quick to apply his knowledge and years of experience to help guide and correct other engines. His catchphrase is "That would never suit his Grace!" which he says upon hearing or seeing something that he takes a disapproval to, or pedantically stating how he thinks someone would have adhered to the rules and regulations in his younger days.

Despite their teasing ways, Sir Handel and Peter Sam are very fond of Duke and dearly nicknamed him "Granpuff" for his long service to the railway.