It is fascinating how the personae of the steam engine has thrived in art, literature and pop culture. There are still plenty of children’s books being printed based on steam engines. Not to mention the popularity of Polar Express and Thomas. Chuggington has attempted to feature diesels more prominently, but has not reached the popularity of Thomas. Even when diesels are featured they are often early streamliners. Diesels just do not have the same character or romance as a steam engine.