In 1899 the railway sold Slieve Donard to Alexander Campbell, co-founder of the P&A Campbell pleasure steamer company. Slieve Bearnagh remained with the B&CDR, occasionally making excursions to Portaferry on the Ards Peninsula, Ardglass in south Down, and Larne and Portrush on the coast of County Antrim in addition to her regular scheduled route on Belfast Lough.