The underground station of Munich U-Bahn trunk line 2 is at level -4 and is orientated in a north–south direction under the station forecourt and has four tracks. It branches to the north as line U1 to Olympia-Einkaufszentrum and line U 2 to Feldmoching. It was originally planned to build the station under the "Kaufhaus Hertie" department store. To enable shorter connections to the main hall and the underground station of lines U 4 and U 5 it was decided instead to build it directly next to the main station. Construction of the U-Bahn station began in the spring of 1975, which required the closure of the station forecourt to surface traffic. The building was built because of its great breadth and depth by the cut and cover method. First the side walls and the roof were built and then the individual levels were built from top to bottom. The U-Bahn station was opened on 18 October 1980. The station is differentiated from the other U-Bahn stations opened in 1980 on line U 2 by the silver lining of the walls opposite the platform and on the pillars in the middle of the station. The platforms connect at the northern end via a mezzanine level to the S-Bahn station and at the south end there is another mezzanine connecting with the U-Bahn station of lines U 4 and U 5. In the middle of the platform escalators lead a mezzanine level connecting with the station forecourt.