I walked the Cowan to Brooklyn section of the Great North Walk the other day for the first time in about 5 year and wondered why I hadn't remembered the steep downhill concreted sections coming into Brooklyn before - until I looked at Google Street View and realised that the track seems to have been diverted at some stage.
The old path and new path are both marked on Google Maps - the old path ended on the main street into Brooklyn from where you had to walk down to the railway station, the new one is marked as "Hobo Hill Track" on Google Street View and comes into Brooklyn from the south:
https://www.google.com/maps/@-33.550228 ... a=!3m1!1e3
Can anyone tell me when (and why) this part of the GNW was diverted?