The Cornish Pumping Engine at Castell Engine Shaft appears to have also served Shaft Newydd, which was a whim shaft. Little evidence remains to definitively identify the Castell Engine site at SJ 2020 5740 or Shaft Newydd to the west of it.

The site is currently farmed at Castell Farm, and the engine house site remains as a small area of waste on the west side of the road that runs north to Eryrys.

A Cornish pumping engine was recorded at Castell Shaft, while Shaft Newydd is associated with a whim, as noted in the CRO AB/40 documents.