Question: Melbourne Central railway station feeds into which main metro station that serves the entire metropolitan rail network?
Context: Helsinki Railway Square (Finnish: "Rautatientori" , Swedish: "Järnvägstorget" ) is an open square immediately to the east of the Helsinki Central railway station in central Helsinki in Finland.  The square serves as Helsinki's secondary bus station along with the main Kamppi Center bus station.  The north side features the Finnish National Theatre, and the south side is formed of the Ateneum classical art museum (part of the Finnish National Gallery).  To the west side are the two ornate entrances to Helsinki Central station—a bigger one for public use, and a smaller one exclusively for the President of Finland and their official guests.  The square is served by the Helsinki Metro system with Rautatientori metro station entrances at the south-west corner, and University of Helsinki metro station to the east. The Nanjing South Railway Station () (IATA: NKJ) is a high-speed railway station in Nanjing, Jiangsu, People's Republic of China, serving the Jinghu High-Speed Railway, Huning Intercity Rail, Ninghang Passenger Railway and the Huhanrong (Shanghai–Wuhan–Chengdu) Railways.  The New Nanjing South Railway Station station is located a few kilometres south of downtown Nanjing.  The station's construction site is already connected with central Nanjing by Line 1, Line 3 and Line S1 of Nanjing Metro.  On September 30, 2016 the metro station served a peak volume of 102,300 passengers.  According to CCTV, it is the world's second largest railway station in terms of GFA (Gross Floor Area) at 458,000 square metre (4,929,871 square ft).  The dimension of the main roof is 456m x 216m (excluding smaller roof on both sides of the main roof), the main roof is constructed with steel weighing more than 8000 tons.  The roof on top of the waiting hall area (part of the main roof) is 72,000 square meter (775,001 square ft).  The entire railway station has 128 escalators, and 28 platforms (a combination of island-platforms and side-platforms).  At the peak of the construction phase, there were more than 20,000 construction workers and engineers at work.  Solar panels cover the majority of the railway station roof and are capable of providing 7.17 MW (megawatt) of electricity. Bihar Sharif Junction railway station, station code BEHS, is a railway station and under Danapur railway division of East Central Railway.  Bihar sharif is connected to metropolitan areas of India, by the Delhi-Kolkata Main Line via Mugalsarai-Patna route.  Station is located in Bihar sharif city in Nalanda district in the Indian state of Bihar.  Due to its location on the Bakhtiyarpur-tilaiya main line many Patna and other cities via express trains coming from Rajgir and Gaya Junction stops here.  Bihar Sharif has well connected trains running frequently to New Delhi railway station, Patna Junction, Varanasi Junction railway station, and Howrah Junction railway station.  Bihar Sharif is well connected with Gaya Junction, Rajgir railway station, Tilaiya railway station, Bhagalpur railway station, and Kiul Junction through daily passenger and express train services. Melbourne Central is a large shopping centre, office, and public transport hub in the city of Melbourne, Australia.  The complex includes the Melbourne Central Shopping Centre, which was refurbished in 2005 by architects Ashton Raggatt McDougall; the Melbourne Central railway station (a part of the City Loop underground railway and formerly called Museum); and the 211 m high office tower with its distinctive black colour and two communications masts.  The centre features a gross leasable area of 55,100 m.  It is owned by GPT Group. Melbourne Central railway station is an underground station on the metro network in Melbourne, Australia.  It is one of five stations (and one of three underground) on the City Loop, which encircles the Melbourne CBD.  The station is under La Trobe Street, between Swanston and Elizabeth Streets, on the northern edge of the CBD.  The station is named after the Melbourne Central Shopping Centre which it is beneath.  It feeds into Melbourne's main metro network station, Flinders Street and also Southern Cross Melbourne's main regional terminus.  In 2013/14 it was the 3rd busiest station in Melbourne's metropolitan network, with 15.925 million passenger movements. Central railway station metro station (Finnish: "Rautatientorin metroasema" , Swedish: "Järnvägstorgets metrostation" ) is a station on the Helsinki Metro in Finland.  The entrance is located in the Asematunneli main hall, which has an exit to the Helsinki Central Railway Station.  It is the only Helsinki Metro station whose name is announced also in English.  There are also some written German language signs on the walls stating "Hauptbahnhof ". Central station is a common name for a railway station.  As well as being used for centrally located stations, such as Manchester Central, and Melbourne Central, "Central" also appears in names of stations that were once served by railway companies which used Central as part of their name—for example Leicester Central railway station was owned by the Great Central Railway and Central Station (Chicago) was owned by the Illinois Central Railroad. Helsinki Central railway station (Finnish: "Helsingin päärautatieasema" , Swedish: "Helsingfors centralstation" ) (IATA: HEC) is a widely recognised landmark in Kluuvi, part of central Helsinki, Finland, and the focal point of public transport in the Greater Helsinki area.  The station is used by approximately 200,000 passengers per day, making it Finland's most-visited building.  It serves as the terminus for all trains in the local commuter rail network, as well as for a large proportion of long-distance trains in Finland.  The station also hosts the Rautatientori metro station, which is the busiest station of the Helsinki Metro. Praha-Smíchov railway station (Czech: "Nádraží Praha-Smíchov" , ] ) is a major railway station in Prague, Czech Republic, located in Smíchov, in the south-west of the city.  It serves as a major railway station on the Czech national rail network, and is connected to the rest of Prague by its metro station of the same name and numerous tram routes which stop on Nádražní street outside the station.  It is also a major bus terminus for lines going to the south and southwest of Prague and beyond.  In 2009 the station served almost 4 million people. Flinders Street railway station is a railway station on the corner of Flinders and Swanston Streets in Melbourne, Australia.  It serves the entire metropolitan rail network.  Backing onto the city reach of the Yarra River in the heart of the city, the complex covers two whole city blocks and extends from Swanston Street to Queen Street.
Answer: Flinders Street railway station