I recieved this document as part of an FOI request for a possible past video (which will have to wait for now). It is a slightly outdated diagram of all service frequencies including AM and PM peak, off peak and weekends.
Sydney Trains Service Diagram
The Sydney Region Outline Plan of May 1968 Principles Diagram gave us regional centres, a reasonable rail strategy and roads srtrategy that needed work. While partially independent of the Coalition government of the day, I don't thing our politicial leaders had much understanding of the lines drawn because they made a mess rather than improvements.