Dunbar is a diesel-electric hybrid chugger from Chuggington. He often works on The Transportainian Main Line as a freight diesel, but occasionally shunts in various yards and junctions across Transportainia.

Dunbar tries to ensure that engines and chuggers are hooked up with the right coach or freight car whenever he’s shunting in the yard. He has a strong work ethic and takes great pride in the role he plays in shaping the young trainees to be successful, hard-working engines. While he lacks much tolerance, Dunbar does care about the trainees, evident by his noticeable anxiety when they go off to make their first deliveries. Dunbar wants to ensure that the young engines and chuggers know how to control new rolling stock before they venture off for the day. When the trainees get frustrated and want to give up, Dunbar encourages them to keep trying; he is full of helpful tips and advice.

His voice should at least come close to sounding like either Andy Nyman (Scottish) or Tom Clarke-Hill (Texan).