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.
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GSR Class J25, An Irish 0-6-0 locomotive class: Great Southern Railways designation of the former Waterford, Limerick and Western Railway locomotives 56, 57, 58, and 2 (see Steam locomotives of Ireland)