A tramroad constructed between Pwll Du Quarry (nprn 85859) and Garnddyrys Forge (nprn 34137) to supply limestone and transport iron goods. It followed the contour of the hill east of the quarry and was cut into the bedrock to form a ledge along the hillside and was later to be incorporated into Hill's Tramroad (nprn 85860).
RCAHMW, 06 November 2007.