"kongsbussen" and "hertugsbussen" were the first catamaran fast ferry to operate in the region. they were built by westermoen hydrofoil in 1973 for fosen trafikklag. the vessels were 199 gross tonnes and 112 net tonnes, long, wide and deep. they had two twelve-cylinder diesel engines, capable of , allowing them to transport the 140 passengers and crew of four at speeds up to . "hertugsbussen" was sold in 1996, while "kongsbussen" was sold in 2003.