The most southern wall under the overpass, which is (for 'normal people') only visible from the train. To get there, you can walk down through the bushes on either side of the road. Parking is possible on the 'Marshallweg', near the other legal walls of the overpass.
You can still get down to write here, I'm new to graffiti writing and it's a nice place to practise in peace and quiet. Only trains will pass you by.
I reckon it's still safe. Very easy to reach and fairly chill spot. Went there to practice throws a week back.
Is this wall still safe to paint?