Question: On what railway does the train service formerly called the "Adelaide Express" run?

Context paragraphs:
Lilac (train): The Lilac (ライラック , Rairakku ) is a limited express train service operated by Hokkaido Railway Company (JR Hokkaido) between Sapporo and Asahikawa in Hokkaido via the Hakodate Main Line since 4 March 2017.  The "Lilac" train service name was also formerly used for express and limited express services operated by Japanese National Railways (JNR) and later by JR Hokkaido between 1963 and 2007.

Bhopal Janata Express: The Bhopal Janata Express was the train service which used to run between Bhopal Junction railway station (formerly Bhopal station) of Bhopal, the capital city of Madhya Pradesh and Mumbai Central railway station (formerly Bombay Central) of Mumbai, the capital city of Maharashtra.  The train is now altered to Kushinagar Express, which is the extended version of Mumbai - Bhopal Janata Express.

The Overland: The Overland is an Australian passenger train service between Melbourne and Adelaide.  It first ran in 1887 as the "Adelaide Express", but South Australians have always referred to the train as the "Melbourne Express".  It was given its current name in 1926.  Now operated by private company Great Southern Rail, the train completes two return trips a week covering 828 kilometres between the state capitals.  Originally an overnight train, it now operates during the day.

6021/6022 Jilin-Harbin Through Train: The 6021/6022 Jilin-Harbin Through Train (Chinese:6021/6022次吉林到哈尔滨东普通旅客列车) is a Chinese passenger train service running between Jilin City to Harbin, capital of Heilongjiang express passenger trains by the Shenyang Railway Bureau, Jilin passenger segment responsible for passenger transport task, Jilin originating on the Harbin train.  25B Type Passenger trains running along the Jishu Railway and Labin Railway across Heilongjiang, Jilin and other provinces and cities, the entire 284 km.  Jilin Railway Station to Harbin East Railway Station running 6 hours and 37 minutes, use trips for 6021; Harbin East Railway Station to Jilin Railway Station to run 6 hours and 55 minutes, use trips for 6022.

K7047/7048 Harbin-Mudanjiang Through Train: The K7047/7048 Harbin-Mudanjiang Through Train (Chinese:K7047/7048 次哈尔滨东到牡丹江快速列车) is a Chinese passenger train service running between Harbin to Mudanjiang with express passenger trains by the Harbin Railway Bureau, Harbin passenger segment responsible for passenger transport task, Harbin originating on the Mudanjiang train.  25G Type Passenger trains run along the Binsui Railway across Heilongjiang provinces, the entire 364 km.  Harbin East Railway Station to Mudanjiang Railway Station running 6 hours and 21 minutes, use trips for K7047; Mudanjiang Railway Station to Harbin East Railway Station to run 4 hours and 25 minutes, use trips for K7048.

Melbourne–Adelaide railway: The Melbourne–Adelaide railway is a standard gauge railway corridor that runs between the cities of Melbourne, Victoria and Adelaide, South Australia.  Most of the current traffic is freight, though the only named and perhaps best known regular train is the twice-weekly passenger service "The Overland", operated by Great Southern Railways

Sapt Kranti Express: The Sapt Kranti Express is a superfast train service of Indian Railways running between Muzaffarpur Railway Station and Anand Vihar Terminal Railway Station.  This Train is operated by the East Central Railway zone of Indian Railways.  Its inaugural run was on 1 July 2002.  Its terminal station was changed from New Delhi Railway Station to Anand Vihar Terminal from 2 December 2010.  It is designated by Train nos. 12557 UP and 12558 DN.  Major stops are Motihari, Bettiah, Narkatiaganj, Gorakhpur, Lucknow and Moradabad.  In July 2002 it became the first broad gauge superfast train to pass through Champaran districts.  The train has its name based on the Sapt Kranti movement led by Ram Manohar Lohia.  It is an certified Train.

Hokuriku (train): The Hokuriku (北陸 ) was a "Blue Train" limited express sleeper train service formerly operated by Japanese National Railways (JNR) and later by East Japan Railway Company (JR East), which ran between Ueno Station in Tokyo and Kanazawa via the Shinetsu Main Line and Hokuriku Main Line.  The journey took more than seven hours.  The service was discontinued on 13 March 2010.

Capital Express (Turkey): The Capital Express (Turkish: Başkent Ekspresi ) was one of the six daily intercity trains operating between Istanbul and Ankara on the Istanbul-Ankara railway before the Yüksek Hızlı Tren high-speed train service replaced all intercity trains on the line.  The Capital Express was the fastest of the six trains, making limited stops only in large cities.  The train would complete it's journey in just over four hours and in the Eskişehir Province, trains would reach conventional speeds of 150 km/h , which still hold the record for fastest conventional train service in Turkey.  When the high-speed rail service was opened between Ankara and Eskişehir on 13 March 2009, the Capital Express, along with the other five intercity trains, were cut back between Istanbul and Eskişehir.  During this period two more daily intercity trains were added, the Sakarya Express and Eskişehir Express, increasing daily intercity service to eight trains.

München-Nürnberg-Express: The München-Nürnberg-Express (literally: "Munich-Nuremberg Express") is a RegionalExpress train service in the southern German state of Bavaria, connecting the two main cities of the state, Munich and Nuremberg.  With its maximum speed of 200 km/h (125 mph), the train is currently (as of 2011 ) the fastest regional train service in Germany.  The train was formerly known under the project name FRESH, expanding to FRanken-Express über die Schnellfahrstrecke in die LandesHauptstadt ("FRanconia Express via the High speed line to the state Capital").

Supporting paragraphs: Melbourne–Adelaide railway The Overland
Answer: Melbourne–Adelaide railway