Former railways within the county include the Great Northern Railway of Ireland and Belfast and County Down Railway both of which were formed in the 19th century and were closed (or amalgamated) in the 1950s.
The Downpatrick and County Down Railway operates a short section of the former Belfast and County Down line as a heritage railway between Downpatrick and Inch Abbey.

Northern Ireland Railways operates the area's modern rail network.
Former railways within the county include the Great Northern Railway of Ireland and Belfast and County Down Railway both of which were formed in the 19th century and were closed (or amalgamated) in the 1950s. The Downpatrick and County Down Railway operates a short section of the former Belfast and County Down line as a heritage railway between Downpatrick and Inch Abbey.
Northern Ireland Railways operates the area's modern rail network.
County Down