SECTOR | RAIL & METRO TUNNELS
The central access structure on Marienhof, which
is approximately 100m-long and 55m-wide, is being constructed using D-Wall/cut-and-cover methods in groundwater. In its extension to the west and east, the compressed air drive is being used to construct the 60m-long platform tunnels for the S-Bahn, which run under the existing underground lines. The 210m-long S-Bahn platform will also be constructed using the ‘Spanish solution’. The transition to the underground station will be constructed using conventional tunnelling methods to the south in the direction of the town hall.
1.2.4 Ostbahnhof station The new 270m-long Ostbahnhof station is being built parallel to the existing above-ground tracks of Ostbahnhof station on Friedenstraße, at a depth of 16m and with a 210m-long platform, enabling all local public transport connections.
Above:
Visualisation of the integrated overall solution of the main station with preparatory structure U9, 2nd core route and new construction of the entrance building SOURCE: DB INFRAGO AG/ FRITZ STOIBER PRODUCTIONS
Below:
Access structure of Marienhof station with central rescue tunnel, the 60m-long platform tubes on the west and east side and the mezzanine level with cube in the middle of the structure
SOURCE: DB INFRAGO AG/ FRITZ STOIBER PRODUCTIONS
1.2.3 Marienhof station The execution at Marienhof includes the construction of the new station, platform tunnels and the connecting tunnel to the existing underground stations on lines U3 and U6, using conventional tunnelling methods. The construction site, which is the size of a football field, is almost completely enclosed: above ground by prominent neighbouring buildings, the pedestrian zone and narrow streets; and, underground by the two existing tunnels for lines 3 and 6.
develop the station district. To this end, the new S-Bahn station for the 2nd core route is being built at a depth of 40m. A newly built, central access point across all levels will take passengers to all the different modes of public transport via ten high-speed lifts and long escalators. The 210m-long platforms of the new S-Bahn station
are designed as a ‘Spanish solution’, i.e., users can board and alight simultaneously via two separate platforms, as is the case with the existing core route. The 14.7m-wide central platform between the two tracks is used for boarding, and two 5m-wide outer platforms on each track are used for alighting.
1.2.5 Leuchtenbergring station Shortly before Leuchtenbergring station, the 2nd core route comes from the west and emerges from below ground. As in Laim, passengers can switch between the existing and new core routes on a barrier-free platform.
2 EXTENSIVE APPROVAL PROCESS A major project such as the 2nd core route requires an extensive planning approval process. All planning documents are made public, objections from various parties are possible, and all technical and legal aspects relevant to the construction project are weighed. The Federal Railway Authority (Eisenbahnbundesamt/EBA) is the competent authority for the planning approval procedure for the project, which was applied for by DB InfraGO AG as project developer and divided into three planning approval sections.
3 GEOLOGY The geology of Munich’s subsoil is well known thanks to extensive preliminary investigations for metro tunnels and stations as well as the existing core route. Due to the buildings in the urban area and because the route of the new core route deviates from the existing line and metro lines, extensive ground investigations were carried out along the alignment of the 2nd core route. Since 2004, numerous exploratory campaigns were
carried out with exploratory drilling at depths of up to 95m. In addition, geotechnical laboratory tests were performed, for example on the swelling behaviour and adhesion of clays, and the abrasiveness of sands. Furthermore, data are regularly collected from groundwater measuring points set up for the project, which provide thousands of measurements every year. The drilling results confirmed the known geology. It
has a heterogeneous structure, i.e., there are alternating layers of crushed rock, sand, clay, silt and, to a lesser extent, gravel. In some areas, the soil is solidified into hard rock by lime. The alternating soil layers are
14 | May 2026
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