Bulgy hated railways, and believed that some day they would all be replaced by roads. He even carried a poster on his side telling people to "JOIN THE ANTI-RAIL LEAGUE". His favourite phrase is "Free the roads!"
Bulgy tried to steal Duck and Oliver's passengers by pretending to be a railway bus. Bulgy was determined to get the passengers to Tidmouth before Duck, but got stuck under a bridge after attempting to take a short cut. His lies were exposed, and soon "nobody would believe his destination boards". Eventually he was turned into a henhouse and placed near the bridge, now nicknamed "Bulgy's Bridge".
In the TV Series, Bulgy was later brought back to the road to help with passengers while Thomas and Emily needed repairs, but the chickens who had lived in him nestled in his luggage racks and caused trouble the following morning. He was then turned into a mobile vegetable stand. Bulgy enjoys his work delivering vegetables, because they don't lay eggs and they never complain.
In magazine stories, he has been converted into a playbus and a greenhouse.
Persona Bulgy was a very rude and bad-tempered double-decker bus. After being restored, he saw the error of his ways and changed his attitude.
According to the "Character Cube" bonus features in the "Thomas Gets Bumped" and "Thomas and the Toy Workshop" DVDs, Bulgy "has no scruples" and "knows how to tell a lie when he is in a tight jam", and is friends with Diesel.
Basis Bulgy is based on an AEC Routemaster bus.
Livery Bulgy was previously painted red and cream, but after becoming a vegetable bus he was painted green and cream. He has since gone back to his old livery.