Part of the plateway system connecting various ironstone and coal levels on the NE slope of Mynydd Aberd're with Cyfarthfa Ironworks.
(SO03030607-SO02150624).

1884 (OS 6-inch 1st Edn.): A branch running from the Ochre Mynydd area past Winch Mawr connecting with the line to upper Cwm-glo.

1905 (OS 6-inch 2nd Edn.): Extant, extended by new construction to west.