Ar 27 a 28 Gorffennaf, roedd Cyngor Sir Powys a Chyngor Castell-nedd Port Talbot wedi cydsynio i gloddwaith ar gyfer y Ganolfan Ragoriaeth Fyd-eang ar gyfer Rheilffyrdd, i’w hadeiladu ar yr hen safle glo brig yn Nant Helen a’r safle golchfa glo gerllaw yn Onllwyn.
On 27 and 28 July Powys County Council and Neath Port Talbot approved consent for the earthworks for the Global Centre of Rail Excellence, to be built at the mothballed opencast mine at Nant Helen and the nearby coal washery site at Onllwyn.