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Because the partition of Ireland placed the Irish border across the DN&G's Greenore – Newry line, it was not absorbed into either the Great Southern Railways in 1925 or the Ulster Transport Authority in 1948.
1920: Fourth Irish Home Rule Act (replaced Third Act, passed and implemented as the Government of Ireland Act 1920) which established Northern Ireland as a Home Rule entity within the United Kingdom of Great Britain and Northern Ireland, and attempted to establish Southern Ireland as another but instead resulted in the partition of Ireland and Irish independence through the Irish Free State Constitution Act 1922.
After the Partition of Ireland the Irish Free State (Consequential Provisions) Act, 1922 abolished many all-island offices, including the Land Commissioners, effective from the the creation of the Irish Free State on 6 December 1922.
Irish Republican Army (1922–62) A split from the "old" IRA that opposed the Anglo-Irish Treaty that solidified the partition of Ireland following the Irish War of Independence.