Chris Tarrant: Extreme Railways

This week Chris Tarrant is in West Africa to experience one of the greatest surviving African railways of the colonial era. Built by French colonists at a cost of tens of thousands of African lives, this railway connects the capital, Brazzaville, far inland on the Congo River, to the coast 310 miles away.

Chris Tarrant crosses the Australian Outback, to find out the truth about an amazing railway. The 2,000 mile-long Adelaide to Darwin Railway is commonly known as "The Ghan Line". It's named after the luxury passenger service that runs on it and the name "Ghan" is said to derive from the Afghan-run camel trains that ferried people and goods across the Outback in the 19th Century.

This week Chris Tarrant is travelling on the Konkan railway which runs down the west coast of India connecting the port cities of Mumbai and Mangalore. Although the British Empire built 40,000 miles of track across this vast sub-continent between, they stayed clear of this narrow, boggy strip of land as it was such a treacherous and difficult environment in which to build a railway.