Depots on the Berlin U-Bahn
Depots on the Berlin U-Bahn are split, just like its trains, into two profiles: the wider "Großprofil" and the larger "Kleinprofil". There is one Kleinprofil and three Großprofil depots. The depots are divided into "Hauptwerkstätten" (Hw, "main depots") and "Betriebswerkstätten" (Bw, "service depots"). Service depots only handle minor repairs and maintenance like changing the windows or removing graffiti. Main depots are used for the full inspections scheduled every few years. Lifting the trains off the tracks is only possible in the main depots. Depots. Grunewald main and service depot. The Grunewald depot is  the only Kleinprofil depot with the exception of the "Hw Seestraße", a Großprofil depot also used for Kleinprofil trains. The depot, which opened on January 21, 1913, is directly adjacent to the overground U-Bahn station "Olympia-Stadion". In 1913, the depot was constructed with one service building, in the following years three more buildings were added: Halle II (1924/25), Halle III (1926) and Halle IV (1927). In World War II, a large part of the complex burned down following an air raid on September 3, 1943. Reconstruction was finished in 1950, along with the rest of the U-Bahn  network. In Berlin U-Bahn jargon the depot is called "Bw Gru" or "Hw Gru". Seestraße main and service depot. The Seestraße depot was opened in 1923, because the new Großprofil line C (now the U6) needed a workshop. It is located north of the Seestraße U-Bahn station. There are 17 tracks here, with two for the main depot and 15 for the service depot, one of which leads to the cleaning area. Because space is limited and the complex cannot be expanded due to its location in the inner city, it is planned to tear down parts  of the workshop. Due to budget cuts by the BVG in 2003, Kleinprofil vehicles are serviced in Seestraße as well. The U-Bahn jargon shorthand for this installation is "Bw See" or "Hw See". Friedrichsfelde service depot. Alongside the construction of the Berlin U-Bahn line E (now U5), the service depot "Friedrichsfelde" was built from 1927 to 1930. The depot is located in the vicinity of the Tierpark U-Bahn station. The buildings I and II, built in 1930, were among the most modern in the U-Bahn system at that time. It was used for East Berlin Kleinpofil  trains, because the east had no Kleinprofil depot. In 1993, when the eastern and western networks were reconnected, this finally changed. The shorthand for the depot is "Bw Fi". Britz-Süd service depot. Because there were more and more Großprofil lines built in West Berlin, it became necessary to think about new depots. Because the extension of the U7 to Rudow was being built at the time, building the depot there was the logical choice. Construction began in 1969 and was finished in 1971. Because the area bought was quite large with 100,000 m, further expansion was considered from the  beginning. In 1988 an extension building for the service workshop was finished. It is the newest and most modern of Berlin's U-Bahn depot. The U-Bahn jargon shorthand for it is "Bw Britz".