BoCo is a diesel, he was known as "the diseasel" when Bill and Ben first met him in 1965. He is a nice diesel like most diesels on Sodor.
BoCo is based on a D7505 who is BoCo's only remaining brother.
BoCo in the eleventh season.
BoCo with Mike in the fifth season.
BoCo pulling the Cocoa trucks.
BoCo on a turntable in a deleted scene of BoCo and the Cocoa.
BoCo with Mike
in the third season.