Picture from Flight Centre
Those who prefer to cross Australia from south to north rather than along the east-west corridor, the route of the Indian Pacific, may choose to ride the Ghan from Adelaide to Darwin by way of Alice Springs. The journey is nearly 3000 kilometres. Regardless of the direction of travel, it requires two nights on the train.
The route followed by this train is named after the Afghan cameleers who originally laid out the travel routes for the railways, helping to construct these as well as telegraph lines across the arid "Red Centre" of Australia.
The climate zone of the area where this train travels as it moves north is hot, hot, hot, and also can be humid. Thus the most comfortable time to travel is Australian winter, between May and July.