 Their survival rate did not match those of the steam locomotives, and when the quarry closed in 1969 only three still survived.Although a nominal two-foot gauge, the actual gauge between the rails at Dinorwic was  in common with its neighbour Penrhyn, but fractionally narrower than the public lines of the Ffestiniog Railway or North Wales Narrow Gauge Railway which were .Early steam locomotives used by the quarry, and built by De Winton & Co.