The 3rd line from your south is definitely the railway line to Krefeld and Mönchengladbach. This crosses the River Rhine and after that splits into the main line in addition to a department to Moers and Xanten at Rheinhausen. North with the station, 7 tracks operate to your River Ruhr https://kamerondimqt.wikitron.com/811726/everything_about_duisburg