South Eastern main line

The South Eastern Main Line is a long-distance railway route in South East England. It crosses Kent from London to the coast at Dover, passing through Sevenoaks, Tonbridge, Ashford and Folkestone. Two other main routes serve Kent: the Chatham Main Line along the north coast and High Speed 1 through central Kent. The line was built by the South Eastern Railway in the 19th century to compete with the London, Chatham and Dover Railway. The line’s history includes engineering challenges like the 30-metre-high viaduct at Folkestone and the blasting of Round Down Cliff. The engineer Sir William Cubitt designed the route with gentle gradients, including a mile-long tunnel at Merstham. Branches were added to Maidstone, Tunbridge Wells and the Isle of Thanet, linking Margate and Ramsgate. Cross-channel services ran from Folkestone and Dover to Boulogne and Calais. A visitor finds stations with through roads built for fast trains, such as Tunbridge, Ashford and Headcorn. The line passes cliffs like Shakespeare’s Cliff and engineering works like the Martello Tunnel. At Folkestone, the harbour branch and station served steamships to Boulogne until tides dictated train times. Dover’s Admiralty Pier, completed in 1871, allowed larger ships to dock.