The village of Abergynolwyn was built to house the quarrymen of Bryn Eglwys and their families, and to serve the village an incline with winding house was laid three quarters of the way along the mineral extension. The winding house for the incline stood on the narrow ledge, with the mineral line passing through it. The two-track incline dropped over a distance of . At its foot, the line crossed the Nant Gwernol on a girder bridge. Immediately after the bridge, short lines branched off to the east from a wagon turntable to the coal yard and smithy of Pandy Farm and west to a writing slate factory (later a carpenter's yard). The main branch then split to form a storage loop, with a further wagon turntable and a longer branch serving the houses and school to the north east. The main branch continued north, crossing the main road then passing between the two main terraces in the village before ending in a turntable and a final short line connecting to the Capel Jerusalem chapel. The village incline was lifted during the early years of preservation, to provide much needed rail to replace the existing track. The winding house was demolished in 1968 to allow realignment of the railway to form the extension to Nant Gwernol.