The town of Coober Pedy is only accessible by a small airstrip, by coach tour or private car, and via the Ghan railway line running between Darwin and Adelaide.
So... it's "only" accessible by air, automobile, or rail? Does their readership travel exclusively by steamship? Camel?
It _is_ a weird sentence though. I guess they wanted to say its only accessible by road?
But that's also a bit weird as that describes 98% of towns in Australia.
I think that might be the most rarely leaves megacities sentence I've ever read.
I read a really good blog series of articles about an american riding his touring bicycle from adelaide to darwin. He had to calculate his water and calories as towns were often over a days ride apart.
Quite a few cars and trucks on the highway though. You would only have to wait an hour at most for a stranger to drive by, stop and help in an emergency.