Mae'r cynlluniau hefyd yn cyflwyno gwaith i wella amseroedd a gwasanaeth teithiau rheilffordd rhwng Caergybi a Chaerdydd a gwella integreiddio â dulliau teithio cynaliadwy eraill ar hyd y llwybr, er mwyn cyflawni uchelgeisiau Llywodraeth Cymru ar gyfer pedwar trên yr awr ar Brif Reilffordd Gogledd Cymru a mynediad rheilffordd haws a chyflymach i Dde Cymru. Bydd y gwaith hefyd yn edrych ar opsiynau ar gyfer dyblu amlder y gwasanaeth bws rhwng Caernarfon a Phorthmadog, er mwyn gwella cysylltedd â chysylltiadau rheilffordd â De a Chanolbarth Cymru.
The plans also bring forward work to improve rail journey times and service between Holyhead and Cardiff and improve integration with other sustainable modes of travel along the route, to meet the Welsh Government’s ambitions for four trains per hour on the North Wales Main Line and easier, faster rail access to South Wales. The work will also look at options for doubling the bus service frequency between Caernarfon and Porthmadog, to improve connectivity to rail links to South and Mid-Wales.