This is very different to the situation in Scotland which has resulted in significant enhancement of its network since 2006 when powers and funding transferred to the Scottish Government.
Mae hyn yn wahanol iawn i’r sefyllfa yn yr Alban sydd wedi arwain at welliannau sylweddol i’w rhwydwaith ers 2006 pan drosglwyddwyd pwerau a chyllid i Lywodraeth yr Alban.