Sydney, the largest city in Australia, has an extensive network of passenger and freight railways. The passenger system includes an extensive suburban railway network, operated by Sydney Trains, a metro network and a light rail network. A dedicated freight network also exists. Future expansion of the light rail network includes the Parramatta Light Rail. Existing light rail services are the Inner West Light Rail and the CBD & South East Light Rail. Central station is the major terminus for Sydney Trains suburban services, while Sydney Terminal (now also known as Central Station) serves NSW TrainLink regional and intercity services. Sydney's light rail network also passes through Central. Journey Beyond's Indian Pacific train service to Perth also departs from here. Sydney's suburban rail network is the busiest in Australia, with over 359 million journeys made in the 2017-18 financial year. Passenger service Suburban rail services in Sydney have been operated since 2013 by Sydney Trains. Over 1 million weekday passenger journeys are made on 2,365 daily services over of track and through 306 stations (including interurban lines). Most trains do not operate between midnight and 4.30am. Suburban services operate along the portions of the main lines from Sydney to the north, west, south and south-west, and also along several dedicated suburban lines. All of these lines are electrified at overhead 1500 V DC, starting in 1926. Some of the suburban stations are also served by the intercity and regional trains operated by NSW TrainLink. Most suburban services operate through central Sydney via the underground City Circle (not a true circle line but a two-way loop extending under the CBD from Central station), the Eastern Suburbs line, or over the Harbour Bridge. There have been long-term plans for a further underground line passing beneath Pitt Street to a new harbour crossing. This is currently under construction as part of the Sydney Metro City & Southwest and expected to be completed in 2024. Timetables are published for all lines, and most lines run on minimum frequencies of every 15 minutes from early morning to midnight, 7 days a week. Frequencies are higher during peak periods and over shared routes. Although frequencies match metro style operation in the city core, few Sydneysiders use the underground network as a metro, most journeys being commuter trips from suburbs into the central city area. An exception to this is the Eastern Suburbs line which serves the high