We also need the UK Government to agree to allow Transport for Wales to operate additional services beyond Severn Tunnel Junction, or additional services through their own rail contracts.
Hefyd, bydd angen i Lywodraeth y DU roi’r hawl i Trafnidiaeth Cymru redeg gwasanaethau ychwanegol y tu hwnt i Gyffordd Twnnel Hafren, neu i gynnal gwasanaethau ychwanegol trwy ei gontractau ei hun.