The Zig Zag Railway in Lithgow, NSW, uses a number of different steam engines to haul passengers up and down the mointainside. This C17 class engine has been with them since 1975. It was originally built in 1949 by the Clyde Engineering Company, in Sydney. I took this shot while holidaying west of the Blue Mountains recently, after taking a ride on this fine old engine.
Note that I have another shot of this engine, here