Of the 20 busiest stations in Wales, more than half are part of the Valley Lines network (not including Cardiff Central and Cardiff Queen Street) and two are in North Wales at Rhyl and Bangor.
O orsafoedd prysuraf Cymru, mae mwy na’u hanner yn rhan o rwydwaith rheilffyrdd y Cymoedd (heb gynnwys Caerdydd Canolog a Gorsaf Heol y Frenhines).