Transport for Wales (TfW) have published a blog of former rail routes that can be walked in Wales. Chris Parker, the Railway Ramblers Area Organiser for Wales is one of the guest contributors to the blog and has provided details of the Blaenavon to Pontypool walk. Chris has also ensured that the TfW blog has a link to the Railway Ramblers website!
Welsh link: https://gloo.to/67nK
English link: https://gloo.to/67wH