This 'Location' sign is something new introduced by John Holland as nothing like that existed under the previous system except those mounted on a Ground Frame or remote Telephone.
I did notice with that 'Location' sign is that it appears small enough to fit inside the old style landmark.
It makes me wonder if having such a sign was the result of a 'Discussion' I had with the then Bathurst District Signals Engineer who was involved in creating a Communications/signaling/Train Order system as he told me the current thought was to remove all fixed signals in Country locations.
One of the problems giving them difficulties was using a GPS on a train in a siding because while it showed the location, it wasnt accurate enough to show which line the Train was occupying.
While this method of Signalling isnt new by any means, my thoughts were that a Driver needed to have some sort of physical object to relate to when crossing or arriving at.
On single line out in the middle of nowhere, why do you need to place a notice board announcing 'Station/Shunting/Yard Limits' other than to clearly define an area that allows train movements to done safely?