This is the oldest remaining power line in Germany I know about. In Germany, nearly all transmission towers built before 1945 are replaced by newer pylons, so very few old towers remain. Originally this line had 70 kV but today a few poles are part of the 20 kV distro grid.

https://de.wikipedia.org/wiki/70-kV-Leitung_M%C3%BClhausen%E2%80%93Freiburg