south. Before terminating at Arabellapark, the U4 passes the stations Prinzregentenplatz, Böhmerwaldplatz, and Richard-Strauss-Straße, the latter being the only station of the line to be equipped with side platforms instead of an island platform. The original plan called for an extension to Johanneskirchen station (where easy transfer to the S8 S-Bahn line would be possible) via Fideliopark, but was never built, due to low current ridership in the area north of Max-Weber-Platz. The extension of the tram line in the area in 2011 made the plan even more unlikely to materialise. A possible extension in the west to Blumenau is even more improbable. In the evenings from around 20.40 to the close of operations, the U4 only operates between Odeonsplatz and Arabellapark. U5 The U5 currently begins at Laimer Platz; an extension to is planned. The total length currently is . The line's signature colour is brown. Via Friedenheimer Straße, the U5 reaches Westendstraße. From there, the U5 shares the tracks with the U4 to Max-Weber-Platz (see above). At Max-Weber-Platz, the U5 branches off to the south to East Station (Ostbahnhof), where changing to all S-Bahn lines is possible. The next station, Innsbrucker Ring, allows cross-platform interchange to the U2. The U5 continues south to Michaelibad, Quiddestraße, and Neuperlach Zentrum, which is the centre of the satellite town of Neuperlach, built during the 1960s and 1970s. Going on to Therese-Giehse-Allee, the U5 comes above ground and reaches its terminus Neuperlach Süd, where it allows cross-platform interchange with S-Bahn line S7. South-east of Neuperlach-Süd is a large parking yard (Betriebsanlage Süd) used to park trains which can't be parked at the technical base in Fröttmaning or within the network. U6 The U6 is the oldest U-Bahn line of the network and also features the oldest tunnel built: the section below the Lindwurmstraße (between Sendlinger Tor and including the station Goetheplatz) was already built 1938-1941 as part of a planned S-Bahn network. For this reason Goetheplatz has a platform longer than the standard . Today the line has a length of . Its signature colour is blue. Since 2006 the northern terminus of the U6 is Garching-Forschungszentrum; via Garching it reaches Garching-Hochbrück. These three stations are outside the city limits of Munich in the city of Garching The distance of to the next station at Fröttmaning is the longest distance between two stations in Munich's U-Bahn network. Fröttmaning has been expanded to