The proposed HS2 high speed line from London to the Northern England was under discussion exactly ten years ago this week.
However, building HS2 between Birmingham and Crewe/Manchester is not yet beyond the strategic evaluation stage and so not guaranteed. If it were, parts of North Wales around Wrexham would benefit through driving to Crewe. North Wales will only benefit more generally if the North Wales Mainline is electrified to Holyhead. This will enable high speed trains to continue their journey on the existing track with higher line speeds.
This principle has worked well in France where TGV trains travel on new lines to, for example, Marseilles and on ‘classique’ track onwards to the Cote d’Azur. However that is the beneficial limit of HS 2 for Wales
