Hmmmm....... I've just been doing a little searching to see what I can come up with on this. It appears that this sign has been doing the rounds on various websites for a couple of years.
I can't find anything on a present-day Newcastle tramway (streetcar) system in N.S.W., nor any link to a Newcastle Tramway Authority there.
It seems that Newcastle used
to have a tram system, but it was disbanded around 1950, about 16 years before Australia changed from LSD to dollars & cents. http://www.railpage.org.au/tram/goddmack.html