page_title: Berlin U-Bahn rolling stock
section_title: B type cars
hierarchical_section_title: Berlin U-Bahn rolling stock / Train profiles / Großprofil / B type cars
caption_attribution_description: English: The Berlin U-Bahn train type BIIDeutsch: Der Berliner U-Bahzugtyp BII
context_page_description: The rolling stock on the Berlin U-Bahn are the main types of cars for the underground railway. They are split into two general categories: Kleinprofil and Großprofil lines. The names refer to the size of the train's coaches. Großprofil coaches have a width of 2.65 metres and a height of 3.40 metres, and Kleinprofil coaches are only 2.30 metres wide and 3.10 metres high. Therefore, the trains have to operate on separate networks.
  Both networks have 1,435 mm standard gauge track and are electrified at 750 volts DC. Because Großprofil and Kleinprofil trains use different types of power supply the trains cannot normally operate on the same route. However, on the Nord-Süd-Bahn in the years between 1923 and 1927 and on the E line between 1961 and 1978, Kleinprofil trains with specially adapted power pickups ran on Grossprofil tracks. They were fitted with special wooden boards on the sides to close the gap between platform and train. These wooden boards were jokingly called Blumenbretter.
  The polarity of the power rails also differs. On the Kleinprofil lines the power rail is positively charged and the track is negative, on the Großprofil lines it is the other way around.
context_section_description: Only after the 1920s German inflation was over Großprofil cars could finally be ordered. In 1924, the first 16 multiple units and 8 normal passenger cars were delivered. Because they had big elliptical front windows, they were commonly called Tunneleulen ("tunnel owls"). The cars were 13.15 meters long and had 3 double sliding doors. This series was called BI.
  From 1927 to 1928, 20 further multiple units and 30 passenger cars were delivered to the Nord-Süd-Bahn AG. Because they had an improved propulsion system, they got the designation BII. They were all deployed to Line 6 and 8, before it was further redeployed in 1966 to Line 6. The last BI and BII trains were retired in the summer of 1969.
caption: A BII type train on special service on the 75th anniversary of the U8
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