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.  Mae darparu mwy o wasanaethau bob awr rhwng y De a Llundain yn rhan o Gynllun Busnes Network Rail 2020.  Er bod y cwmni sydd â’r rhyddfraint wedi dweud yn glir nad yw am gynnal y gwasanaethau hyn, rydyn ni’n gefnogol i gynlluniau gweithredwyr eraill i gynnal gwasanaethau amlach, gan gynnwys cynnig Grand Union Trains i ddarparu mwy o lawer o wasanaethau rhwng Caerfyrddin a Llundain, a fyddai’n cynyddu’r gwasanaethau yn Llanelli, Abertawe a Chaerdydd.  Rydyn ni’n gobeithio y gwnaiff y Swyddfa Rheilffyrdd a Ffyrdd ganiatáu inni ddechrau’r gwaith paratoi er mwyn i’r gwasanaethau allu dechrau yn ddiweddarach yn 2021.
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. An additional hourly service between South Wales and London is shown in the 2020 Network Rail Business Plan. While the franchised operator has made it clear that it will not operate these services, we continue to support other operators’ plans to increase frequencies, including Grand Union Trains’ proposal to provide a significant increase in services between Carmarthen and London, which would also provide additional services at Llanelli, Swansea and Cardiff and look to the Office of Rail and Road to allow preparations to start services later in 2021 to begin.