Realising that the railway was receiving low traffic outside of working hours, the line was extended northwards to Seaforth Sands on 30 April 1894 in order to reach more residential areas. The extension brought the total length of the railway to and cost a total of £10,000. While the passengers had previously been primarily travelling to businesses and the city, the Seaforth extension resulted in a large increase in traffic from residents of the outer areas of Liverpool. An extension southwards from Herculaneum Dock to Dingle was opened on 21 December 1896. Dingle was the only underground station, the extension from Herculaneum Dock being achieved with a lattice girder bridge and a half-mile () tunnel through the sandstone cliff to Park Road.