Shortly after the start of operation, a second stage of expansion was planned for the Rhine-Neckar S-Bahn to integrate previously unserved cities and regions into the S-Bahn network. However, the schedule laid down in the "Realisierungsprogramm Rhein-Neckar-Takt 2010" (implementation program for the 2010 Rhine-Neckar clock-face timetable), which provided for further expansion to Homburg, Bruchsal, Karlsruhe, Eppingen, Darmstadt and Worms, between 2008 and 2010, was rejected again in 2006. The reasons for this were the reduction of funds made available under the federal Rail Regionalisation Act ("Regionalisierungsgesetz") in accordance with the so-called "Koch-Steinbrück paper" as well as the need to finance infrastructure measures required for capacity increases in the north of the region, in particular the Frankfurt–Mannheim high-speed railway.