U6 is a 19.9 km (12.4 mi) long rapid transit line on the Berlin U-Bahn with 29 stations. It runs in a north-south direction from the Berlin locality of Tegel in the north via Friedrichstraße to Mariendorf, a locality in the southern part of the city. It is one of the five large profile ("Großprofil") lines.
Friedrichstraße, one of the stations on the U6
Entrance to the Borsigwerke station
The embankment station at Scharnweberstraße
The underground northern terminus of U6, Alt-Tegel (formerly Tegel)
The U7 is a rail line on the Berlin U-Bahn. It runs completely underground for a length of 31.8 kilometres (19.8 mi) through 40 stations and connects Spandau, via Neukölln, to Gropiusstadt and Rudow. The U7 was originally the south-eastern branch of the Nord-Süd-Bahn (U6) that ran between the branching point at Belle-Alliance-Straße (Mehringdamm) and Grenzallee; however, in the 1960s, this stretch was separated from the rest of the line and extended at each end to form a new line.
A train at Rudow, the eastern terminus of the U7
Rudow terminus station platform.
Altstadt Spandau: Last station before the terminus Rathaus Spandau