large, shell-like structure made from glass and steel, which is drawn nearly down to track level on one side. The U1 terminates at Mangfallplatz below Naupliastraße. U2 The route of the U2 line has undergone more changes than any of the other Munich underground lines. It also changed its name as it was first called U8. It is the only line that runs or ran on all three "line families" (U1/U2, U3/U6 and U4/U5). Today it has a length of and 27 stations. The line's colour is red. The U2 starts in the north at Feldmoching, where it connects to the S1 to Freising/Airport. The station there is decorated with rural and urban motives of Feldmoching's history. Below Hasenbergl, a district which had been known for its social problems, it goes to Dülferstraße, which provides access to the eastern Hasenbergl and a newly built area on Panzerwiese. Dülferstraße was the terminus from 1993 till 1996. Via the stations Harthof and Am Hart, the U2 reaches Frankfurter Ring. In the tunnel between Am Hart and Frankfurter Ring, there is a white and blue wave pattern, which is the only installation of art in a Munich U-Bahn tunnel outside of stations. After Milbertshofen station the U2 touches the U3 line at Scheidplatz, where cross-platform interchange is possible. Before the opening of the section to Dülferstraße in 1993, U2 went from Scheidplatz to Olympiazentrum, sharing the track with the U3. Through the district of Maxvorstadt the U2 continues to downtown Munich, reaching the stations Hohenzollernplatz, Josephsplatz, Theresienstraße und Königsplatz. At Königsplatz one can find artworks from the nearby Glyptothek on the platform. At München Hauptbahnhof (Munich Central Station), the U2 meets the U1, with which it shares tracks until Kolumbusplatz (see above). After Kolumbusplatz the U2 continues eastward and reaches the stations Silberhornstraße, Untersbergstraße and Giesing Bahnhof, with an interchange possibility to S3 and S7. The next stations are Karl-Preis-Platz and Innsbrucker Ring, where cross-platform interchange to the U5 is possible. Until 1999, when the branch to the Messestadt stations was opened, the U2 ran from here to Neuperlach. Via the stations Josephsburg and Kreillerstraße the U2 reaches Trudering, which features two platforms in separate tunnels, connected by two transversal tunnels. In 1994, during the construction of this section, an accident happened: the ceiling of the new tunnel collapsed due to the intrusion of water and a bus fell into the crater. Two