The Global Centre of Rail Excellence would be located on the site of Nant Helen Open Cast Mine in Onllwyn, which is currently operated by Celtic Energy.
Byddai’r Ganolfan Ragoriaeth Fyd-eang ar gyfer Rheilffyrdd ar safle Glo Brig Nant Helen yn Onllwyn, sy’n cael ei redeg gan Celtic Energy ar hyn o bryd.