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U1

1980年，U1和当时的U8(现为U2)同时启用。初时U1只在U2线部分路段上运行。当前往红十字广场站的支线开通后，U1被分拆成独立线路，以绿色为主色。

现时U1总长度为12.2千米（7.6英里），共有15个站。线路北端位于莫萨赫区的奥林匹克购物中心站。U3线亦于2007年延伸至该站。接着线路沿哈瑙街南行至由弗兰茨·阿克曼设计的格奥尔格·布劳赫勒环路站，再抵达西部陵园站。经过格恩站后便抵达红十字广场站，亦即1983年至1998年的U1总站。抵达梅林大街站和斯蒂格迈尔广场站后U1与U2在慕尼黑中央车站汇合。

在U1和U2共轨的路段，列车全日5分钟一班。U1亦与慕尼黑快铁及U4和U5交汇。在下一站，即森德灵门站，本线与U3和U6交汇。在该站U1和U2两个方向的月台在不同隧道中，由行人隧道连接。

弗劳恩霍夫大街站由于靠近伊萨尔河，中双轨由独立钻挖式隧道连接。但是由于采用岛式月台，月台上有不少大柱作支撑。横渡伊萨尔河后，U1在科伦布广场站再与U2分开。

南端支线于1997贯通，通过色彩缤纷的坎迪广场站后便抵达天石广场站。下站，即圣屈伊兰广场站以玻璃天幕建成。U1最终以芒法尔广场站作总站。

U2

U2线的改变次数比任何其他线都要多。建成时该线被称为U8，现时长度为24.4千米（15.2英里），共有27站。该线以红色为主色。

U2线以费德莫兴站作北端起点，与慕尼黑快铁S1交汇。该站建筑现代，显示该区由农村变成城市的过程。途经治安较差的哈森勃格站后该线向南到连接新社区的杜夫大街站。该站亦是1993年至1996年的总站。

在哈特霍夫站和哈特畔站的南边，U2抵达法兰克福环路站。哈德畔站和法兰克路站之间的隧道上画有白色和蓝色的波浪，亦是慕尼黑地铁中唯一一个在站外隧道中的公共艺术。

经过米贝茨霍芬站后，U2与U3在帅德广场站交汇。在该站转车时只须过对面月台，而不必换层。在1993年，杜夫大街站开通前，U2和U3共轨，经由帅德广场站前往奥林匹克购物中心站。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 S7 and S3. 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 passengers and one construction worker died and the construction was delayed.

Via Moosfeld, the U2 reaches Messestadt-West and its terminus Messestadt-Ost. These stations are located between the fairgrounds (Messestadt) in the north and a development area and the Bundesgartenschau 2005 in the south.

U3

The U3 is the original Olympic line; the first section was opened for the Olympic Summer Games 1972. Today the line has a total of length of 21.2千米（13.2英里） and 25 stations. The line's colour is orange.

Today the U3 starts in the north at Moosach, Munich's 100th U-Bahn station, where you can change to the S1 to Freising/Airport. From here the line runs east to Moosacher St.-Martins-Platz and Olympia-Einkaufszentrum, where a change to the U1 is possible. After passing through Oberwiesenfeld station, the U1 reaches its original northern terminus at Olympiazentrum. From 1972 until 2010, this station was the end of the original Olympic line.

When Munich was awarded the Olympic Summer Games 1972 in 1965, the U-Bahn network concept (which was adopted only one year earlier) had to be revised to speed up the construction of a connection to the Olympic venues at Olympic grounds. The Olympic connector (now U3) was redesigned as a branch of the U6 line, because the original plan of a direct connection to the Olympic ground from Munich Central Station was not feasible in the shortness of time. This original U3 sections consists of four stations (from north to south): Olympiazentrum, Petuelring, Scheidplatz, where cross-platform interchange to the U2 (the line originally supposed to serve the Olympic venues) is possible since 1980, and Bonner Platz. After Bonner Platz the U3 reaches Münchner Freiheit, where it joins the U6 to run together through the inner city section to Implerstraße (for this section see U6 below).

After leaving the three-track junction station Implerstraße, the U3 reaches Brudermühlstraße, Thalkirchen (Zoo) and Obersendling, which is built 30米（98英尺） higher than the Thalkirchen station, because it is located on the "Hochufer" (western tread) of the River Isar. Here, interchange to the S-Bahn at Siemenswerke station is possible. The U3 continues west via Aidenbachstraße and Machtlfinger Straße, before reaching Forstenrieder Allee, Basler Straße, and eventually the terminus Fürstenried West. This southern-eastern section was opened on October 28, 1989, as can be seen from huge date numbers on the western entrance of Obersendling station.

U4

With only 9.2千米（5.7英里） and 13 stations, the U4 is Munich's shortest U-Bahn line. This line has originally been planned as U9 and is the only line that operates regularly with 2-train sets rather than the full 3-train set. The exceptions are Fridays in the late afternoon and during the Oktoberfest. The line's colour is mint green.

The U4 begins in the west in the Laim neighbourhood at Westendstraße station, which it shares with the U5 line. Both U4 and U5 are the only lines of a joint line "family", which only branch out on one end of the common line, as an originally planned western extension of the U4 was first put on hold and was subsequently cancelled altogether.

From Westendstraße the U4 runs east to Heimeranplatz, which connects to S7 and S20 S-Bahn lines. The next two station, Schwanthalerhöhe (originally called Messegelände, the German for "exhibition grounds"; the name was changed when the exhibition centre relocated to Riem in 1998) and Theresienwiese, are gateways to the Oktoberfest, and are therefore highly loaded during this event. Between both aforementioned stations, there is a track that links to Implerstraße to provide a connection to the depot in Fröttmaning.

Theresienwiese is one of only two U-Bahn station in Munich (besides Fröttmaning station which serves Allianz Arena) to have the command centre booth that is opened during the Oktoberfest for supervising the masses of passengers. The south exit of the station leads to the northern entrance of Oktoberfest. U4 trains arriving from the east often terminate at Theresienwiese rather than continue to Westendstraße even during peak hours due to low traffic volume east of Hauptbahnhof.

After Theresienwiese the U4 reaches München Hauptbahnhof (Munich Central Station); passengers can transfer to U1/U2 lines as well as to all S-Bahn lines (except S20) here. The next station is Karlsplatz (Stachus) with shorter and easier connections to S-Bahn (S1 to S8). Karlsplatz is the deepest station in Munich's U-Bahn network (36米（118英尺） below the surface). From this point on, the U4 runs north of the S-Bahn cross-city tunnel.

After passing Odeonsplatz, where an interchange to U3/U6 trains is possible, and Lehel, the U4 crosses the River Isar in a tunnel, and reaches Max-Weber-Platz, the last station that is shares with the U5. Here, the U4 branches off to the north, while the U5 runs 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 Pasing is planned. The total length currently is 15.4千米（9.6英里）. 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 120米（390英尺）. Today the line has a length of 27.4千米（17.0英里）. 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 4.1千米（2.5英里） to the next station at Fröttmaning is the longest distance between two stations in Munich's U-Bahn network. Fröttmaning has been expanded to two island platforms and four tracks to cater for the Allianz Arena football stadium, built for the 2006 Football 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 dubbled "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. 1千米（0.62英里） west of the current terminus, is planned and agreed upon, and is supposed to open in 2019.

U7

This new booster line 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 the tracks with the U1 from Westfriedhof to Kolumbusplatz, the U2 from München Hauptbahnhof to Innsbrucker Ring, and the U5 from Innsbrucker Ring to its southern terminus Neuperlach Zentrum.

The stations along U7 line are Westfriedhof, Gern, Rotkreuzplatz, Maillingerstraße, Stiglmaierplatz, München Hauptbahnhof, Sendlinger Tor, Fraunhoferstraße, Kolumbusplatz, Silberhornstraße, Untersbergstraße, Giesing Bahnhof, Karl-Preis-Platz, Innsbrucker Ring, Michaelibad, Quiddestraße, and Neuperlach Zentrum.

U8

This booster line started operations in December 2013. The U8 begins in the north at Olympiazentrum and shares the tracks with the U3 as far as Scheidplatz, where it continues along the U2 tracks to München Hauptbahnhof and terminates at Sendlinger Tor. It is only running on Saturdays to ease crowding on the U2 and U3 lines, and to provide people an easier access to the Olympic Park from Munich Central Station.

The stations along U8 line are Olympiazentrum, Petuelring, Scheidplatz, Hohenzollernplatz, Josephsplatz, Theresienstraße, Königsplatz, München Hauptbahnhof, and Sendlinger Tor.