The series is titled Great Australian Railway Journeys.

Australia Post Philatelic Group manager Noel Leahy said: “With such vast distances in Australia, the building of railway networks was a huge undertaking.

“Rail used to be a primary means of transport to access some of the country’s most remote locations.”

This stamp issue not only showcases four great Australian trains and the dramatic landscapes they pass through, but also pays tribute to the remarkable engineering feats.

It features three 55c stamps – the Ghan, the Indian Pacific, the West Coast Wilderness Railway in Tasmania – and one $2.10 international stamp, Kuranda Scenic Railway.

Celebrating its 81st anniversary this year, the Ghan covers nearly 3000 kilometres through Australia’s outback, connecting Adelaide with Darwin, and takes just three days.

Prior to its existence, outback communities relied on camel drivers to deliver supplies.

The Indian Pacific is one of the last coast-to-coast trains in the world, linking the Indian Ocean on Australia’s west coast with the Pacific Ocean on the eastern seaboard, and traversing more than 4300km.

The West Coast Wilderness Railway is only 35km long on Tasmania’s west coast, and crosses 42 bridges along the King River over mountainous terrain.

Originally built in the 1890s, the railway connects Queenstown and Strahan.

Lastly, the Kuranda Scenic Railway winds its way from Cairns to Kuranda in northern Queensland.

The scenic route passes through rainforest, over bridges and is one of the most scenic journeys in the country.

The railway is 75km and traverses 15 tunnels and 37 bridges.

The stamps were designed by Melinda Coombes and went on sale last Friday at Australia Post retail outlets.

They will also be available via mail order on 1800 331 794 or from the online shop.