There's certainly no political will here at all, not has there been for decades, and that's not going to change.
However, international carbon-emission agreements and resultant EU rules may well overtake things at some stage; let's hope they do. What Ireland has against it, of course, is small distances. However, properly thought out, you would imagine that basic system of goods trains from Dublin to Waterford, Cork, Tralee, Limerick, Galway, Athlone, Ballina, and Belfast or Derry should be feasible.