A two-storey railway signal box, operated by the Llanelly and Mynydd Mawr Railway (nprn 411059), formerly stood on the east side of the entrance to the North Dock (nprn 34207) and controlled the swing bridge (nprn 34210) over the entrance. By 1971 the box was out of use and had been clad with corrugated sheeting. It has been demolished.
B.A.Malaws, RCAHMW,15 June 2010.
