This is a wall next to the old outer circle railway line in Melbourne. Its one of the few decommissioned railway lines in the inner suburbs. It used to run from Fairfield to Alamein. The same route has now is used as a shared pathway. This wall is highly sought after surface. The surrounding fences are wooden which absorbs the graffiti paint (not desirable). As the timber deteriorates so does the quality of the paint. There us a real mix of work and most parts of the wall has been painted.
For further info on the railway http://en.wikipedia.org/wiki/Outer_Circle_Trail