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In page Ayr and Dalmellington Railway:

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The ironworks closed in 1921, since which time the mineral traffic on the branch had been devoted to extractive industries alone.[3] The Dalmellington line had long been subordinate to the Stranraer route; the point of divergence via Dalrymple Junction. The branch passenger service closed on 6 April 1964.[4] The line between Falkland Junction and Dalrymple Junction continues in use for Stranraer line passenger services, and mineral trains use the Dalmellington branch to access open cast mining sites near Dalmellington. The trains use the original line as far as Waterside, near Drumgrange, from where a private mineral line climbs into the hills above, and to the north of, Dalmellington. The branch is known now as the Waterside branch.