1. Rare, locomotive-type steam boiler used to power a haulage engine for a coal level at the head of the Rhondda Fawr, probably operating in the 1880s. The surrounding remains of coal working and quarrying cover an area some 350m E-W x 150m and straddle the Rhondda Fawr (centred on SN 9237 0150); they include at least four coal levels, a quarry and the formation of a tramway.
B.A.Malaws, RCAHMW, 01 May 2003.

2. Locomotive-type boiler survives outside small level with superb outcrops of the top horizons of the Coal Measures.
(A Guide to the Industrial Archaeology of South East Wales, AIA, 2003)
B.A.Malaws, RCAHMW, 04 June 2010.