2nd Main Line: Tunnel Boring Machine Assembly at Marienhof

The construction of Munich's 2nd S-Bahn Main Line reached a pivotal technical milestone today at the Marienhof site, located directly behind the Neues Rathaus. The first massive components of the custom-built tunnel boring machine (TBM) have been lowered into the 40-meter-deep excavation shaft. This complex logistical operation involves heavy-duty cranes and precision engineering to position the TBM's cutterhead and shield, which will eventually bore the deep-level tunnels toward the Main Station and Laim. The assembly process is expected to continue throughout the summer, with the machine scheduled to begin its underground journey in early 2027.

Engineers from Deutsche Bahn and its partner firms are working in multi-shift rotations to ensure the site remains on schedule. The Marienhof station is one of the project's most challenging components due to its depth and the surrounding historic architecture. Sophisticated monitoring systems have been installed to detect any minute movements in the foundation of nearby buildings, ensuring that the heavy construction activities do not compromise Munich's structural heritage. The arrival of the TBM components marks a transition from the intensive excavation phase to the active tunneling phase of this multi-billion euro infrastructure project.

The 2nd Main Line is Germany's largest urban rail project, aimed at significantly increasing the capacity and reliability of Munich's commuter network. By creating a second underground corridor through the city center, the project will allow for higher frequencies and better bypass options during incidents. While the construction has caused long-term disruptions in the heart of the city, officials emphasize that the long-term benefits—reducing traffic congestion and meeting future mobility demands—are essential for the region's sustainable growth. Local residents can follow the progress through a dedicated visitor center at Marienhof, which offers VR tours of the future underground station.