The U-Bahn opened in 1968, and has been expanded several times. It consists of three inner-city tunnels and above-ground lines in the suburbs. About 59% of the track length is underground. The above-ground sections operate at different standards from traditional rapid transit systems due to the independent expansion of at-grade rail for those sections -- they are more like light rail due to their not being fully grade-separated.
The network consists of 86 stations on nine lines, with a total length of 64.85 kilometres (40.30 mi). Eight of the nine lines travel through the city center (line U9 being the exception). In 2012, the U-Bahn carried 117.3 million passengers, an average of approximately 321,000 passengers per day.
These clips were taken on Saturday the 22nd of February and Sunday the 23rd of February 2014.
