Hopefully the Youghal branch, next section of WRC, closed section of MGWR main line, Navan line, Derry Road, Lisburn & Antrim line, the Waterford & Wexford line, and (my personal favourite but perhaps unrealistic) a line between Navan and Portadown with stops at Kingscourt and Armagh. None of these may ever open though, but with how rail transport is on the rise, maybe we should be hopeful!