at the earliest. New S-Bahn line from Karlsfeld to Dasing Rings and Spurs (Ringschlüsse und Spange): Neufahrner Kurve (Neufahrn Curve): this will facilitate the travel between Freising and Munich Airport without switching back at Neufahrn. The construction was completed, and the RE train service to Regensburg and Landshut was commenced on 9 December 2018. Erdinger Ringschluss (Erding Loop): this line will connect with S1 and S8 at Munich Airport and with S2 at Erding. If completed, it would make two loops with one larger and one smaller, stopping at Hauptbahnhof and Munich Airport. Due to the military base nearby, the tunnel is required. Still in discussion. Walpertskirchner Spange (Walpertskirchner Spur): this line extend the Erdinger Ringschluß from Erding to proposed S2 East extension, connecting somewhere between Walpertskirchner and Thann-Matzbach. Still in discussion. Verknüpfungskurve S7 - Rosenheim: Like Neufahrner Kurve, this spur makes travelling between the city centre in Munich and Rosenheim easier without switchback at Kreuzstraße. Four-Track Expansions: Four-track extension of S8 line to the Munich Airport and moving the surface railway to the underground between Leuchtenbergring and Unterföhring. The extra tracks are for freight trains, which must pull aside often for S-Bahn. If the four-track extension is completed, the airport express train could use the freight tracks as to bypass the local service. Still in discussion. Four-track extension of S4-West between Buchenau and Pasing. The extension is due to the opening of Gotthard Tunnel in Switzerland. This will increase freight transports between northern and southern Europe going through central Europe. The first phase is from Pasing to Puchheim. For cost reasons, the extension would terminate at Eichenau for time being. In planning. Other Projects: Possible relocation of the S2 East to the Munich International Trade Fair site. Now cancelled. New stations at Breitenau, Emmering, Weichselbaum, Menterschwaige, Schwaigerloh, Sendlinger Spange, Gelting, and Messestadt Nord. Network map Literature See also Munich U-Bahn List of rapid transit systems References External links Munich S-Bahn Live map Munich S-Bahn blog Interessengemeinschaft S-Bahn München e.V. Fahrgastverband PRO BAHN zur Münchner S-Bahn tunnelaktion.de – Alternative concepts for the Munich S-Bahn / Description of alternatives to the second city tunnel from the years 2001-2007 Flash animation of the concept Teilausbau Südring (upgrade of southern rail connector for S-Bahn lines) – Details for one of the concepts presented on www.tunnelaktion.de S-Bahn in Germany Rail transport in Bavaria S-Bahn 1972 establishments in West Germany Deutsche Bahn