Robertsons Creek Fire Trail / Track starts at co-ordinates 37 - 58.477S and 145 - 51.693E at the intersection of South Hells Gate Track, Roberstons Creek Fire Trail and Quartz Creek Road.  

Heading along the track from this direction, you will encounter steep ascents and descents.  There are also several rocky parts of the track and a lot of the track is also rutted, so either lift or picking a good line is required.

I would suggest starting at this end as you will end up descending one or two of the steeper sections rather than ascending.  Both of the steeper sections are very rocky.

Towards the end of the track you will have three options,

1.  Continue straight, end up on a dirt bike track ( requires some tree negotiation ) and exit onto Forest Road

2.  Turn right at 90 degrees at the bottom of the second steep descent and travel to Forest Road along Rocky Track ( see track log )

3.  Turn right at the bottom of the same hill at 45 degrees and head back to Forest Road along Birrell Track. 

If you have lift, I would take the Rocky Track option.