To reach the quays, No.42 had first to pass over a short tramway from the BNCR goods yard to the Belfast Harbour Commissioners' tramway. To accomplish this feat required three persons to drive and conduct her, and if more than two wagons were attached, a fourth to look after them. Two of these people were equipped with red flags. While on the tramway her driver was not allowed to sound the whistle, open the cylinder drain taps or allow the engine to blow off. The maximum speed was to be three miles per hour.