Paying Homage to John Whitton

On the way back from Sydney today we stopped for a brief walk to the Knapsack Gully Viaduct which is located on the eastern escarpment of the Blue Mountains. 
It is a famous and, I'll admit, very beautiful piece of Australian transport infrastructure. 
Mr isbi is a fanatic on the topic so he will give all the details on his blip at isbiJG if you're interested.