Dowlais Iron Company's railway: Jcn.85507/85509 (SO09890572) - Tunnel Pits (SO09450624).
Ordnance Survey six-inch Second Edition map (1901: Extended and incorporated in Pant-y-waun Mineral Railway.
The site was destroyed in twentieth-century land reclamation.
Recorded as part of RCAHMW Uplands Initiative Project, W B Horton, H & H, 17/09/2013.