two island platforms and four tracks to cater for the Allianz Arena football stadium, built for the 2006 FIFA World Cup. The technical base of the U-Bahn is located at Fröttmaning, too. After passing Kieferngarten station, which has two island platforms as well, it crosses over a rail bridge to Freimann and Studentenstadt. Between these two stations is a connection to mainline railway tracks, which is used to bring new trains into the network. The bridge was originally used by the tram and was the only tram track to be converted to be part of the U-Bahn network. The U6 then continues underground for the rest of its way south. Via Alte Heide, Nordfriedhof (station with side platforms), and Dietlindenstraße, the U6 reaches Münchner Freiheit, where it joins the U3 on the shared inner city tunnel. Passing Giselastraße and Universität (University), it arrives at Odeonsplatz, where it connects to the U4/U5 lines. Continuing to Marienplatz, it crosses the S-Bahn lines. During peak hours this station is can get overcrowded, which is why additional pedestrian tunnels were built between 2003 and 2006. At Sendlinger Tor the U3/U6 crosses the U1/U2 line, and interchange is possible. The line now uses the tunnel built in 1941 mentioned above as far as Goetheplatz. The next station, Poccistraße was added belatedly, constructed between the two existing tunnels which stayed operational. At Implerstraße the U3 and U6 separate again. To the north of the station, facing north, there is a branch to the U4/U5 at Schwanthalerhöhe, which is not used for passenger transport. At Harras the U6 connects to the S-Bahn lines S7 and S27, and to regional trains to the south. The section via Partnachplatz and Westpark to Holzapfelkreuth was constructed for the Internationalen Gartenbauausstellung (IGA) in 1983 was therefore dubbed "flower line", which is reflected in the design of these stations. Passing Haderner Stern and Großhadern, the U6 reaches its current southern terminus at Klinikum Großhadern, where the entrance to the station is covered by a glass pyramid. An extension to Martinsried, which is only approx. west of the current terminus, is planned and agreed upon, and is supposed to open in 2026. U7 This new booster line (it only operates during rush hours) was added in December 2011 along with the new tram extension to St. Emmeram. The U7 runs between Westfriedhof and Neuperlach Zentrum via München Hauptbahnhof and Innsbrucker Ring: it shares