Mae cynghorwyr lleol wedi rhoi sêl bendith i gyfleuster profi rheilffyrdd newydd o'r safon uchaf ar hen safle cloddio glo brig ym mhen cymoedd Dulais ac Abertawe.
A new world-class rail testing facility on a former opencast mining site at the head of the Dulais and Swansea valleys has been given the seal of approval by local councillors.