Australia is as wide as, and is taller than USA. It’s a large country

We have one main train line across the country horizontally, and two vertically. The vast majority is uninhabited.

We’re talking about an infrastructure project that has to supply reliable high voltage power across the entire country (4000 km), build multiple new train lines across the entire country, and even then you still need trucks for distribution within states as rail is not capable of last mile delivery