A couple of other options needed? 'Yes, but when it only went as far as Alice'... and 'Yes, but the original route via Oodnadatta'.
I think they come under "Yes - but not all the way to Darwin". Original routing option would be just too swanky and make so many members jealous!
(Full disclosure, I've never been on the Ghan, but was once very nearly bitten by an unstable dachsund that was prowling round some disused sidings at Tarcoola Junction. I picked up a discarded track fastening spike in case I needed to seriously defend myself, and later carried said spike back on the aircraft, something that these days would probably cause the baggage scanning people to ask questions...)
Haven't I read somewhere that dachshund are the worst tempered of all dogs?