Question: Is the North East railway line between the two largest cities in Australia?

Context paragraphs:
North East railway line: The North East railway is in the north-east of Victoria, Australia.  From the state capital Melbourne to the New South Wales Main South Line at Albury, via Seymour, Benalla, Wangaratta and Wodonga.  It is a key component of the Sydney–Melbourne rail corridor.

Central Coast &amp; Newcastle Line: The Central Coast & Newcastle Line is a NSW TrainLink passenger train service that runs along the Main North railway line in New South Wales, connecting the state's two largest cities, Sydney and Newcastle.  The service runs from through to on the Main North railway line to on the partly-closed Newcastle railway line, and services the Hawkesbury River region, the Central Coast and the city of Newcastle.

Whitfield railway line: The Whitfield railway line was a narrow gauge railway located in north-eastern Victoria, Australia, branching from the main North East railway at Wangaratta to the terminus of Whitfield.

Halle–Bebra railway: The Halle–Bebra railway, also known in German as the Thüringer Bahn ("Thuringian Railway"), is a 210 kilometre-long railway line from Halle (Saale) via Erfurt and Gerstungen to Bebra, mainly in Thuringia.  As far as Gerstungen the line originally belonged to the Thuringian Railway Company.  From Gerstungen to Bebra, it was owned by the Frederick William Northern Railway ("Friedrich-Wilhelms-Nordbahn"), named after the Prussian king, Frederick William IV.  It is now a two-track, electrified, standard gauge mainline operated by DB Netze.  It was opened between 1846 and 1849 and was the first railway line in Thuringia (apart from a small piece of the Leipzig–Hof line of the Saxon-Bavarian Railway Company —"Sächsisch-Bayerische Eisenbahn-Compagnie"— near Altenburg).  All types of trains from Regionalbahn to ICE currently run on the line except Interregio-Express.  Four of the six largest cities in Thuringia are located on the line.

Sydney–Melbourne rail corridor: The Sydney–Melbourne rail corridor is an approximately 960 km standard gauge railway corridor that runs between Melbourne and Sydney, the two largest cities in Australia.  Freight and passenger services operate along the route, such as the NSW TrainLink XPT passenger service.  The XPT offers a day and night service in each direction.

Oaklands railway line, Victoria: The Oaklands railway line is a freight only railway line in north eastern Victoria, Australia.  The line branches from the main North East railway at Benalla station until it connects with the New South Wales railway network at Oaklands, New South Wales.

Southern Aurora: The Southern Aurora was an overnight express passenger train that operated between Australia's two largest cities, Sydney and Melbourne.  First-class throughout, including the dining facilities, the "Southern Aurora" featured all-sleeper accommodation.  The train first ran on 16 April 1962 after the opening of the North East standard gauge line from Melbourne to Albury, eliminating the break-of-gauge between the capital cities.

Wahgunyah railway line: The Wahgunyah railway is a closed railway line in the north-east of Victoria, Australia.  Branching off the main North East railway at Springhurst, it ran north to Wahgunyah.  The terminus was near the New South Wales Culcairn - Corowa railway, but no bridge was ever provided over the Murray River.  As the two lines were of differing gauges and the stations 2.5 kilometres (1.25 miles) apart there was probably no particular benefit for the expense of building a bridge to connect the two differing systems.

Heathcote Junction railway station: Heathcote Junction railway station is located on the North East railway line in Victoria, Australia.  A station, originally called Kilmore Junction, was opened at the site on 17 March 1890, at the point where the former Heathcote branch line left the main line.

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.

Supporting paragraphs: North East railway line Sydney–Melbourne rail corridor
Answer: The Sydney–Melbourne rail corridor is an approximately 960 km standard gauge railway corridor that runs between Melbourne and Sydney, the two largest cities in Australia.