be built to the north of Munich Marienplatz station, will be the only all-new station on the line; other stations will be expanded to accommodate the new tunnel. With focus on express service and shorter travel time, the second tunnel will bypass six current stations between Laim and Ostbahnhof. Most of express S-Bahn with limited stops will use the second tunnel: the proposed express S-Bahn routes are S18X (Herrsching-Leuchtenbergring), S21X (Landshut-Leuchtenbergring), S23X (Mering-Flughafen München), and S24X (Buchloe-Leuchtenbergring). Two of current S-Bahn routes will be transferred to the second tunnel upon the completion: S1 (Flughafen München/Freising-Ebersberg) and S6 (Tutzing-Leuchtenbergring). Optimisation (Optimierung) The initial design called for second S-Bahn station underneath Orleansplatz at Ostbahnhof with long pedestrian tunnels connecting to the aboveground station serving regional and long-distance trains and current S-Bahn. This design received many negative criticism from the public, especially the residents in Haidhausen neighbourhood quarter. The residents have grave concern about tunnelling and earth extraction impacting their housing and disrupting their daily lives. The new EU directives call for more escape tunnels and rescue access points to be incorporated in the design. The forthcoming construction of new U9 subway station at the Hauptbahnhof requires the further tweaking of master build plans (reconstruction of main building and second S-Bahn station). On 3 July 2019, Deutsche Bahn announced the new "2. Stammstrecke — Die Optimierungen" (Second Trunk Line Optimisation). The optimisation project called for second S-Bahn station at Ostbahnhof to be moved from Orleansplatz to the southeastern side of Ostbahnhof platforms along the street, Friedenstraße. The entire second S-Bahn station will be underground and connected to the current S-Bahn platforms via staircases, escalators, and lifts. The advantages of new location are its close proximity to the entertainment quarter in the southeast, higher capacity flow with more direct access to the aboveground platforms, better connection to Berg am Laim S-Bahn station, and platforms closer to the ground (16 metres deep instead of 40). The relocation necessitated realignment and lengthening of S-Bahn tunnels between Marienhof and Ostbahnhof. The new EU directive requires the third tunnel for escape and rescue to be constructed between two tunnels and access points to the aboveground be added at every 600 metres. The benefit of new design allows quicker passenger evacuation from the tunnels, easier access for the rescue personnel, and simpler access for maintenance crew. The State of Bavaria and Munich city council wants the first U9 station