Why doesn't Australia upgrade its existing railway lines instead of building a fast train from scratch? - Quora
![Maps showing the development of the South Australian railway network... | Download Scientific Diagram Maps showing the development of the South Australian railway network... | Download Scientific Diagram](https://www.researchgate.net/profile/Nicholas-Sheard/publication/339675771/figure/fig1/AS:865233954418690@1583299258601/Maps-showing-the-development-of-the-South-Australian-railway-network-from-1900-to-2000_Q320.jpg)
Maps showing the development of the South Australian railway network... | Download Scientific Diagram
![File:Comparison of cross-sections of South Australian Railways vintage broad and narrow gauge passenger cars.jpg - Wikimedia Commons File:Comparison of cross-sections of South Australian Railways vintage broad and narrow gauge passenger cars.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Comparison_of_cross-sections_of_South_Australian_Railways_vintage_broad_and_narrow_gauge_passenger_cars.jpg/1280px-Comparison_of_cross-sections_of_South_Australian_Railways_vintage_broad_and_narrow_gauge_passenger_cars.jpg)
File:Comparison of cross-sections of South Australian Railways vintage broad and narrow gauge passenger cars.jpg - Wikimedia Commons
![File:South Australian Railways narrow gauge locomotive T232 on broad gauge crocodile car.jpg - Wikimedia Commons File:South Australian Railways narrow gauge locomotive T232 on broad gauge crocodile car.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/c/ce/South_Australian_Railways_narrow_gauge_locomotive_T232_on_broad_gauge_crocodile_car.jpg)