I am trying to make a series of maps showing local rail lines around Sydney every 10 years, similar to those I made for New York and other cities. For consistency with the other maps I have made, I want to show just those services that ran at least every 20 minutes at midday on weekdays. Does anyone know where I could get copies of old timetables of CityRail lines around Sydney (including from when they were run by State Rail, and earlier) or other information on when the lines became this frequent? I'm especially short of information about the Northern Line and South Line before 2000. Thanks.