A monorail at Werribee would certainly be quite amazing; especially if it ran along the Werribee river!Monrails have been popular at zoos overseas including Chester Zoo (twice the size of Melbourne Zoo) and the Bronx Zoo (five times the size of Melbourne Zoo).
It would serve little practical purpose at a zoo Melbourne’s size, but I see no reason it wouldn’t be an asset to Monarto; or potentially Werribee.
Something like this may be useful, especially with viewing the fifty acre elephant complex.