I think the loco is Australian, from Victoria state railways, made in the uk, it is a typical 0-6-0 goods engine from one of the private loco builders, the cab, lights, cow catcher, etc. may have been added in australia but the Westinghouse brake pump and piping would be from the original build.
Just arrived on the docks, maybe?
One British builder that comes to mind is the Vulcan foundry.
Date maybe 1870s 1880s
Mike