Berlin U-Bahn U4

Berlin's U-Bahn line U4 is a north-south-line, situated completely in the city's borough of Schöneberg. The line has only 5 stations and is 2.9 km (1.8 miles) long. It is the shortest of the U-Bahn lines. The volume of passengers is not very high, and trains run with only two cars, at a 5 minute frequency in rush hours and 10 minutes other times. There is no night operation.

In the beginning of the 20th century the then-independent city of Schöneberg was planning a municipal railway in its western part. There were long discussion about whether a underground, elevated or suspended railway should be built. After the "Hochbahngesellschaft" (the association of the elevated railway in Berlin), which owned the "Stammstrecke" (the main line what is now the U1 and the U2), decided not to take part in this line, because they thought it wouldn't turn a profit, the city of Schöneberg built this line on its own. After two years of building the line opened December 1st, 1910. Schöneberg was thus the sixth city in Europe having an underground railway. One day before opening, Schöneberg and the "Hochbahngesellschaft" decided on a combined fare, and the management of the line went to the "Hochbahngesellschaft" with Schöneberg still being the owner of the line.

Nollendorfplatz is the northern terminal of the line. Here it makes a connection to the Stammstrecke lines (U1, U2, and U3). When the U4 was opened in 1910, the Stammstrecke station at Nollendorfplatz, which had opened in 1902, was an elevated station (the next stations westward are underground). An underground station named "Schöneberger Bahnhof" was built for the U4 in the south of Nollendorfplatz, with an underground passageway to the Stammstrecke station. Between 1915 and 1926, the Stammstrecke station at Nollendorfplatz was reconstructed with two underground levels and one elevated level. After the new station opened, station "Schöneberger Bahnhof" was closed, because the U4 could now stop in one of the underground levels of Nollendorfplatz. At Nollendorfplatz, all four of the narrow-profile U-Bahn lines are connected, and it is also the station with the most U-Bahn lines in Berlin. During World War II, the elevated station was heavily damaged and was rebuilt very simply. The dome roof it has today was rebuilt in 1999 with money from local donations.

Today, the U2 runs on the elevated tracks (two tracks, two side platforms). The upper of the two underground levels (two tracks, one island platform) has the eastbound trains on the U1 to Warschauer Straße. The lower level (also two tracks and one island platform) have the westbound U1 trains and terminating U3 and U4 trains. A set of tail tracks north of the station connect the upper and lower levels. The walls of the underground levels have grey/violet flagstones and yellow stilts. On the west end of the station is the entrance hall.

Viktoria-Luise-Platz is under the street "Motzstraße". It has a single island platform and the station is in a light green color. There are entrances on both ends of the platform. The southwest entrance is at "Viktoria-Luise-Platz" and it is the original one; the northwest entrance was opened in 2004 because of safety for the passengers (in 2000, there was a train fire at a station with only one entrance; since then it was decided, that every station in Berlin should have not less than two exits). This entrance is in the street "Motzstraße".

Bayerischer Platz is under the "Bayerischer Platz", named after the biggest state in Germany, Bavaria. The station colors are blue and white, just like the colors of Bavaria. It has a single island platform and the entrances are on both ends of the platform. The U4 station is in the upper level. This station was rebuilt twice, first, after massive damage in World War II, and a second time when the U7 station was built in lower level. U4 and U7 are connected via a tunnel. The station has a headhouse from 1957 which is more a simple one and not as beautiful as the original headhouse.

Rathaus Schöneberg is next and it is something very special. It seems like an underground station, but it is above ground. It has no walls, it has windows. The station is in the Rudolph-Wilde-Park, named after Rudolph Wilde, who was mayor of Schöneberg at the time the U4 was built and the biggest supporter of the line. The park is one part of a very long park complex in the boroughs Schöneberg and Wilmersdorf. The original station name was "Stadt Park" (city park). The station was completely destroyed in 1945 but was reopened in 1951 in the same style with the name "Rathaus Schöneberg", named after the city hall of Schöneberg, which is just around the corner. The park is in a little valley and the station has a footbridge over it. The station has a shortened single island platform with a entrance at the northern end of the platform and an emergency exit on the other end of the platform.

Innsbrucker Platz is the last station of the line. It has a single island platform and is designed in light grey and red color. The station opened as "Hauptstraße" named after the street which is crossing the station. In 1933, the S-Bahn station on the nearby ring line opened and both stations were named Innsbrucker Platz.

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