Carnlough (correct spelling) is on the Co. Antrim coast.The song was composed by "The Poet McKay" from the same area. What you have of the song is all there is. It is of course like the Road to Dundee which is older. There is a big Scottish influence on music in the Glens of Antrim because of the proximity to Scotland. Likewise there is an Irish influence on the opposite coast.
regards Sid (Carnlough)