This was a private railway network ranging from the Portland Pits in the East to Codnor Park/Ironville and thence Buttterley Works in Ripley and Lower Hartshay/Buckland Hollow in the West. It had various Branches and connecting Tramways and was used for the movement primarily of Coal and Ironstone, Bricks and Iron products from Butterley Companies mines, furnaces and mills. Several traces of the route exist today and some sections can be walked. The line originated from Butterley works in Ripley and the NGR given is for the lower works yard. On the Jacksdale to Portland sections there are some notable remains inclkuding the Drumhouse at Jacksdale and various alignments along the way. The top of the incline into Mexborough top colliery can be traced as well as the junction for the branch to the Mexborough collieries.