It was initially planned as a fully elevated line, because the ground in Berlin is quite muddy indeed. In the summer of 1907, the elevated railway company of the new city of Wilmersdorf suggested the building of an underground line to the Wilmersdorf area. It is elevated on the majority of it's route actually. (previous | next | back to album | 2020:09:28 13:58:35 | 79% of an album)