Regional rail services between Hamburg, Ahrensburg and Bad Oldesloe have seen a steady increase in passenger numbers in recent years. Trains on this route have already reached more or less their full capacity. Local, regional and long-distance services all use the same track and, as a result, they often impede each other, leading to delays and cancellations. In addition, travellers have to change trains to get to destinations within Hamburg. This is only possible at the city's main station, which simply adds to the congestion there. It is precisely these problems that the S4 will alleviate.
We are responding by constructing the S4. This new S-Bahn line will provide the region's inhabitants with better local transport between Hamburg and Bad Oldesloe. We are constructing two additional tracks along the existing line. They will carry the S4 once this work is finished, replacing the RB 81 regional service. It often suffers from disruptions due to the mixing of local and long-distance trains on the current line. Regional train RE 80 between Hamburg and Lübeck will continue to operate. We are also building a total of five new stations in Schleswig-Holstein and Hamburg.
Further information is available in the S4 image brochure.
The details of the planned construction measures can be found here.
You can downloadall the project's preliminary planning documents from the website of NAH, Schleswig-Holstein's local transport association.
People in Hamburg and Schleswig-Holstein's Stormarn district will benefit equally from the new line.