The major rail system for passengers Sydney, Melbourne, Brisbane, Perth and Adelaide is constantly evolving and expanding over time. Commuter rail in Australia usually operates all day with two-way service in Sydney and Melbourne. The system in Perth operates on a shorter route but with much higher frequency, especially in the main tunnels.|Sydney is one of the busiest train systems in the country with nearly 1 million trips per day. Although there are fewer trips, the Melbourne tram system needs a larger system to operate.|Historically, trams have been operating in Australian towns and cities for a long time and most of these were closed before the 1970s in the belief that car ownership was more widespread. will make them unnecessary. Melbourne is an exception, it has the largest train station anywhere in the world.