The MidWales Railway was closed from this day (31st December) 1962. Today, the railway system in Wales is in three major disjoint parts - South Wales, North Wales, Cambrian lines in MidWales.
There are suggestions of linking the various sections, but re-opening Merthyr to Moat Lane and Afon Wen to Bangor would seem unlikely candidates. I never say "never", mind you.
https://en.wikipedia.org/wiki/Mid-Wales_Railway
Image -
Copyright Ben BrooksBank Creative Commons license shows the low level platform where the line crosses the Central Wales (Swansea to Shrewsbury) line which, against many odds, has survived until today.