The Castle Douglas and Dumfries Railway was a railway in south west Scotland which linked Castle Douglas in Kirkcudbrightshire to Dumfries. It opened in 1859. Other companies' lines extended westwards and southwards, and the CD&D line formed a key link in opening up the agricultural area of south-west Scotland. When Stranraer and Portpatrick were reached by the contiguous lines, the CD&D line was the eastern section of the Port Road, which provided an important route from English originating points to Northern Ireland by ferry between Portpatrick and Donaghadee. Much later the ferry route was from Stranraer to Larne.
