But first, the answer to the last one.
The G.& M.R. foundation stone is in the wall of a former railway building in Lauren Street, North Melbourne. It is now part of John Holland Rail Division, and is at 171 Lauren Street. The building was adjacent to (or part of?) the former VR printing works.
Sorry for the continued Melbourne basis for the questions, but...
There was a brief discussion in another forum about the French and Italian words for "station". Where is there a street with a French railway-related name, and why is this a suitable question for the Railway Archaeology forum?