sentences:  In 1876 the INW merged with the Northern Railway of Ireland and the Ulster Railway to form the Great Northern Railway.The GNR operated the line between Dundalk and Enniskillen until 1957, when the Government of Northern Ireland made the GNR Board close all cross-border lines except the Dublin and Belfast Junction Railway main line.Córas Iompair Éireann continued a freight service between Dundalk and Clones for a few years, but withdrew this and closed the line in 1960.