High Quality Content by WIKIPEDIA articles! The Steyning Line (also known as the Adur Valley Line) was a railway line that connected the West Sussex market town of Horsham with the once bustling south-coast port of Shoreham-by-Sea, with the possibility of an onward connection to Brighton. Covering a distance of 20 miles (32.19 km), the line closed on 7 March 1966, a casualty of the Beeching Axe.