Crocodillia is one of the meanest diesels ever. He has a huge streak of bad deeds, liuke causing trucks to derail, trains to be late, and other means things. He's so bad he even earned flames, cross swords, and A skull and crossbones. He has crocodile-like teeth and spikey hoods that represents a crocodile's back. When he first met Dash-9, he cause a lot of greif to the diesel. So much, that Crocodillia is the only diesel that really spooks Dash-9.