I recently observed some Train station floor plan data popup into OpenStreetMap, eg. http://openlevelup.net/?lat=-33.797354&lon=151.180968&z=21&t=0&lvl=-1&tcd=1&urd=0&bdg=0&pic=0&nte=0&ilv=0
The detail and exact positioning led me to suspect that it was more than someone independently mapping but rather from an existing floorplan map. The person who did these uploads says they get the data partly from NSW Transport.
Does TfNSW publish station floor plans as open data? Where can I access it?