Valvegear, I'm reminded of the old joke, I may not be rich, but my old man's got piles.
Deadlaker, I went on an an A.R.E. Closed Line Inspection tour of the Irrewarra-Newtown line in May 2005. I recall a we passed large trestle just out of Newtown that I surmised was the Italian Gully bridge. The piles (or Pyles) were intact, but I don't think the decking was. I haven't been back since. I think I'll have to go down that way once we're out of house arrest.
In relation to the quiz, I'll say Mount Evelyn, for the same reason that Duttonbay suggested Bannockburn.