The following from the Rail Australia's website.
The Ghan will commence regular services to/from Darwin from 8 Feb 2004.
The extension of The Ghan to Darwin will further enhance what is already considered one of the world's great train journeys. The 47 hour, 2979km transcontinental journey will feature off train touring options at Alice Springs and Katherine Gorge at modest extra cost. You will soon be able to experience the tropical splendour of the Top End aboard The Legendary Ghan.
More info at: The Ghan goes to Darwin February 2004
For info on the current fares and schedules of The Ghan see: The Ghan - Fares and Schedules
As you might have guessed, I just got back from a week in Brisbane, Queensland, Australia.
Jishnu.