sentences:  A new track (in parts two) are planned to be built along the line from Troisdorf to Bonn-Oberkassel so that services on line S 13 can be extended from Horrem via Cologne Hauptbahnhof, the airport and Troisdorf to Oberkassel.It is planned that another service would run via Bad Honnef to Linz am Rhein.No decision has yet been taken to extend line S 13.