Part of the plateway system connecting various ironstone and coal levels on the NE slope of Mynydd Aberd're with Cyfarthfa Ironworks.
(SO03260626-SO03160629).

1884 (OS 6-inch 1st Edn.): A branch connecting No.2 Pit (Ironstone) to the line to upper Cwm-glo.
- direct access from No.2 Pit to/from north.

1905 (OS 6-inch 2nd Edn.): Track shown as removed.