Maent hefyd yn cipio prosiectau mwy uchelgeisiol, hirdymor gan gynnwys trydaneiddio o Gaergybi ar draws i Gaer ac estyniadau i orllewin Cymru ac i'r gogledd o Ynys Môn.
They also capture more ambitious, long term projects including electrification from Holyhead right across to Chester and extensions to west Wales and to the north of Anglesey.