My favourite thing about U7 is the Jungfernheide station. It sort of quite bland and even neglected but... it hides an extra platform that was supposed to connect centre of the city with Berlin Airport (now sadly closed).
The station also used to connect to Siemensbahn which is a totally dilapidated and forgotten train line with a huge historical significance for the city.
The station also used to connect to Siemensbahn which is a totally dilapidated and forgotten train line with a huge historical significance for the city.