 260 trains used the section daily at that time—300 in the peak summer period.The section was later reduced to double tracks between Shields Junction and Arkleston Junction during the mid 1960s as part of the resignalling works associated with the railway electrification of what is now known as the Inverclyde Line services between Glasgow Central and Gourock and Wemyss Bay, and the slow lines were removed between Arkleston Junction and Wallneuk Junction (the point of divergence of the Ayr line and the Greenock line) during the 1980s electrification of the Ayrshire Coast Line.As part of the now abandoned Glasgow Airport Rail Link, work started in late 2007 to reinstate a third track between Shields Junction and Arkleston Junction and four passenger lines between Arkleston Junction and Wallneuk Junction.