On what railway does the train service formerly called the "Adelaide Express" run?
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
Silver City Limited The Silver City Limited was a passenger train operated by Australian National between Adelaide and Broken Hill.