Line S 9 is an S-Bahn line on the Rhine-Ruhr network, operated by DB Regio. It runs from Recklinghausen Hbf / Haltern am See in the north through Gladbeck West - Essen Hbf to Hagen (Westphalia) Main Station in the south. During the day two services per hour run between Wuppertal and Gladbeck West, one service per hour between Gladbeck and Recklinghausen Hbf and Gladbeck and Haltern am See and one service per hour between Wuppertal and Hagen, using FLIRT 3XL electric multiple units. Line S 9 runs over lines built by various railway companies: