runs between Mammendorf and Holzkirchen. : The S27 operated from Starnberg wing station at the main station along the route of the S7 to Solln, crossed the Isar on the Großhesseloher bridge and ran on to Deisenhofen. On 15 December 2013, the S27 was abandoned and replaced by regional trains of the Meridian. : From 1995 to 2014, the line A was the only non-electrified Munich S-Bahn line, which ran on the Dachau–Altomünster railway. It was made into a branch of the S2 on 14 December 2014, and was finally electrified. Intra-Urban Long-Distance Lines The connection between the Hauptbahnhof and the Ostbahnhof, called the "Südring", runs west from Hauptbahnhof before turning south and curving toward Ostbahnhof without any stops in between. The trains travelling on this route (DB50) are included in the MVV tariff scheme and offer a view of the city while the travel time is slightly longer than the Stammstrecke tunnel. Additional regional lines make calls at stations also served by the S-Bahn but provide an effective express functionality for MVV passengers. The examples include: Garmisch-Partenkirchen to Munich, calling at Tutzing (S6) and Pasing (Stammstrecke) Augsburg to Munich, calling at Mammendorf (irregularly) and Pasing (Stammstrecke) Regensburg to Munich, calling at Moosburg, and Freising (S1) Rosenheim to Munich, calling at Grafing Bf (S4) and Ostbahnhof (Stammstrecke) Various southern lines of the BRB, calling at Holzkirchen (S3) and several S7 stations (Solln (weekends), Siemenswerke (weekdays), Harras, Donnersbergerbrücke, Main Station) Former S27 route served by the BRB from Deisenhofen to Main Station via Solln and then along the S7, stops at all stations apart from Hackerbrücke Rosenheim to Holzkirchen calling at Kreuzstraße (S7) and Holzkirchen (S3), sometimes continuing to Munich Lindau to Munich, calling at Geltendorf (S4) and Pasing (Stammstrecke) Nürnberg to Munich, calling at Petershausen (S2) and Dachau Bf (S2) Expansion plans announced by the MVV on 7 April 2017 include express S-Bahn lines with limited stops operating through the second tunnel now under construction. History An underground railway line for Munich was first proposed in 1928 in a report on the "relocation of traffic centres". An underground route would allow "direct long distance traffic to and through the city centre". On 22 May 1938, the first tunnel, which was part of the north–south route, was started in the Lindwurmstraße, between the present-day underground stations Sendlinger Tor and Goetheplatz. In the speech of Julius Dorpmüller, the general director of Deutsche