Gyda’r tendrau terfynol fod i ddod i law erbyn diwedd y flwyddyn, mae gennym dri chwmni â chymwysterau o'r radd flaenaf yn cyflwyno'u hachosion penodol eu hunain ar sut y byddant yn cyflawni'r amcanion uchelgeisiol a bennwyd, gyda'r nod o sicrhau newid mawr i wasanaethau rheilffyrdd i deithwyr ar draws Cymru a'r Gororau.
Arriva Rail Wales have notified Transport for Wales that they intend to withdraw from the bidding process for the next Wales and Borders rail franchise.  It is not uncommon for bidders for major projects to withdraw during the tender process and Arriva has been clear they have done this for their own commercial reasons.