Question: What was the population of one of the suburbs of Melbourne that this steam era railway line ran through?

full_context: Document 1: North Melbourne railway station: North Melbourne railway station is located on the northern edge of the central business district of Melbourne, Australia. The station is a major interchange point with the Craigieburn, Flemington Racecourse, Sunbury, Upfield, Werribee and Williamstown lines all servicing the station. It opened on 6 October 1859. It is listed on the Victorian Heritage Register.
Document 2: Parkville, Victoria: Parkville is an inner suburb of Melbourne, Victoria, Australia, 3 km north of Melbourne's Central Business District. Its local government areas are the Cities of Melbourne and Moreland. At the 2016 Census, Parkville had a population of 7,409.
Document 3: Middle Park, Victoria: Middle Park is an inner suburb of Melbourne, Victoria, Australia, 4 km south of Melbourne's Central Business District. Its local government area is the City of Port Phillip. At the 2011 Census, Middle Park had a population of 4,058.
Document 4: Sandringham railway line: The Sandringham railway line is a suburban railway line in Melbourne, Australia. It branches from other southeastern lines (Caulfield group) at South Yarra station. It serves the City of Bayside, and small sections cover the Cities of Glen Eira, Port Phillip, Stonnington, and Yarra. Various sections of the track opened between 1857 and 1859, and in May 1919, the whole line was electrified.
Document 5: Albert Park, Victoria: Albert Park is an inner suburb of Melbourne, Australia, 3 km south of Melbourne's central business district. Its local government area is the City of Port Phillip. At the 2011 census , Albert Park had a population of 5,955.
Document 6: Inner Circle railway line: The Inner Circle was a steam era suburban railway line (later electrified) in Melbourne, Australia. It served the inner-northern suburbs of Parkville, Carlton North, Fitzroy North, and Fitzroy. At its closure, it ran from Royal Park station on the Upfield line (Melway map ref: 29 F11) in the west, to a triangular junction with Rushall and Merri stations on today's South Morang line in the east. (Melway map ref: 30 D11) There was also a branch line to Fitzroy that opened at the same time.
Document 7: Craigieburn railway line: The Craigieburn railway line is the suburban electric railway inner section of the main North East railway line serving the northern suburbs of Melbourne, Australia. It has 15 stations across Myki ticketing zones 1 and 2. Prior to electrification it was called the Broadmeadows railway line.
Document 8: Port Melbourne, Victoria: Port Melbourne is an inner suburb of Melbourne, Australia, 5 km south-west from Melbourne's Central Business District. It is split between the local government areas of Melbourne and Port Phillip. The area to the north of the West Gate Freeway is in the City of Melbourne. The area to the south is in the City of Port Phillip. At the 2011 Census, Port Melbourne had a population of 14,521.
Document 9: Albert Park, Victoria: Albert Park is an inner suburb of Melbourne, Australia, 3 km south of Melbourne's central business district. Its local government area is the City of Port Phillip. At the 2011 census , Albert Park had a population of 5,955.
Document 10: Docklands, Victoria: Docklands (also known as Melbourne Docklands to differentiate it from London Docklands) is an inner-western suburb of Melbourne, Victoria, Australia, 2 km (1.2 mi) from Melbourne's Central Business District. Its local government area is the City of Melbourne. At the 2016 Census, Docklands had a population of 10,964.
Document 11: Montague railway station: Montague was a railway station, now converted to light rail, on the former Port Melbourne railway line in the inner Melbourne suburb of South Melbourne, Australia. The station was located to the south of Montague Street road underpass, between Woodgate Street and Gladstone Lane, with a large goods shed located on the Melbourne side of the station. The station has since been demolished and is now served by route 109 trams stopping at a pair of low level platforms.
Document 12: City Circle: The City Circle is a system of largely underground passenger railway lines located in the Sydney central business district, in New South Wales, Australia, that make the core of Sydney's passenger railway network. The lines are owned by RailCorp, a State government agency, and operated under Transport for NSW's Sydney Trains brand. Despite its name, the City Circle is of a horseshoe shape, with trains operating in a U-shaped pattern. The constituent stations of the Circle are (clockwise): Central, Town Hall, Wynyard, Circular Quay, St James, Museum and back to Central.
Document 13: North Melbourne, Victoria: North Melbourne is an inner suburb of Melbourne, Australia, 2 km north-west of Melbourne's Central Business District. Its local government area is the City of Melbourne. At the 2011 Census, North Melbourne had a population of 11,755.
Document 14: Port Melbourne, Victoria: Port Melbourne is an inner suburb of Melbourne, Australia, 5 km south-west from Melbourne's Central Business District. It is split between the local government areas of Melbourne and Port Phillip. The area to the north of the West Gate Freeway is in the City of Melbourne. The area to the south is in the City of Port Phillip. At the 2011 Census, Port Melbourne had a population of 14,521.
Document 15: City Circle tram: The City Circle is a zero-fare tram running around the Melbourne City Centre in Australia. Aimed mainly at tourists, the route passes many Melbourne attractions while running along the city centre's outermost thoroughfares, as well as the developing Docklands waterfront precinct. It operates in both clockwise and anti-clockwise direction.
ground_truth: 7,409