The Railway Archives has a large collection of maps and diagrams of the railways in Australia, both current and historical. A selection is available here.
Current Maps
New South Wales
NSW Trainlink Regional Trains and Coaches network map
Sydney
Victoria
Victorian Regional Train and Coach Network Sep 2023
Melbourne
Melbourne Tram Network Sep 2023
Melbournes Free Tram Zone map Sep 2023
Victorian train network Sep 2023
Queensland
Brisbane
Qld 220531-train-busway-tram-network-map
Adelaide/South Australia
Western Australia
Perth
Historic Railway Maps
Australia
New South Wales
NSW – Railway Digest map
NSW diagram map
Queensland
Victoria
Victoria Map 1932
VR_Suburban_map_1965