This network consisted eventually of over 100 miles of tracks connecting the farms of Sennybridge and the Fforest Fawr (where Christie wanted to improve the land through application of lime), with the charcoal burning centres and coal extraction below Fforest Fawr, with the lime kilns at Penwyllt and ironworks at Ystradgynlais, and the Swansea Canal dock for other industries down stream.