Tuncester is correct. Great work, Rodo.So Tuncester (516 miles ex Sydney) not Bentley (509 miles ex Sydney) so Rodo's earlier attempt was right. The following 1969 NSWGR timetable has both stations shown as well as the three stations between Tuncester and Bentley https://docs.google.com/file/d/0ByB-ppGeDyvwV3VtNUV4RzNJWHM/edit
Over to you.
Maybe near Colbinabbin?Perhaps not far off. The surroundings look right for some of the area covered by the Colbinabbin branch (as opposed to the parts where the irrigation whatsit is apparent).