Whilst driving from Hornsby to Galston one day I noticed some heavily protected downhillers walking their bikes up the road. Today I decided to check it out. Now about 500 metres west of the bridge I found what looked like a cycle path exit emerging from the forest just after a guard rail on the left hand side of the road while driving west. I walked about 50 metres along it and this does seem to look like the tail end of a down hill track. The track has has a lot of effort put into it at some point.

Can anyone shed any light on this?