Apparently when it was opened, there was only a short 'Dead End' at Top Points which due to wet conditions, a locomotive ended up hanging over the drop below when it couldnt stop in time.
I believe somehow they managed to extend the length of the 'Dead End' to prevent it happening again.
A photo of this engines 'predicament' is on display the the Lithgow McDonald's store along with others taken of the era.
At times the area is beset with cold, wet windy and occasional snow conditions which would all contribute to an 'exhilarating' journey down the magnificent Zig Zag to the valley below.
Prior to the rails being relaid, the Zig Zag was a road used by those who resided in the Railway Cottages (long gone) when they went to town.
Like the road bed from Newnes Jct to the Glow Worm Tunnel, it was still rutted from where the sleepers had been which made the drive somewhat bumpy as it was never graded or maintained.