Fodd bynnag, ni all ein holl uchelgeisiau gael eu cyflawni drwy Trafnidiaeth Cymru ar hyn o bryd. Fel y nodais yn fy nghyflwyniad i Adolygiad Rheilffyrdd Williams ym mis Rhagfyr, safbwynt y gwnaeth y Cynulliad ei gymeradwyo yn ddiweddarach, mae angen trefniant ariannol tecach arnom oddi wrth Lywodraeth y DU. Mae angen gwasanaethau trawsffiniol gwell arnom drwy fasnachfreintiau'r Adran Drafnidiaeth, ac rydym angen gwelliannau i'n seilwaith - seilwaith y credwn y dylem ei reoli yn yr hirdymor - ond yn y tymor byr mae'n rhaid i’r gwelliannau hyn gael eu gwneud drwy Network Rail.
However, not all of our ambitions can currently be delivered through Transport for Wales. As I set out in my submission to the Williams Rail Review in December, a position which the Assembly later endorsed, we need a fairer funding settlement from the UK Government, we need better cross-border services through Department for Transport franchises, and we need improvements to our infrastructure – infrastructure which in the long term we believe we should control - but in the short term must have improvements delivered through Network Rail.