World's Most Dangerous Railway Lines

A look at the Bernina Express, which fights its way from Switzerland to Italy over 196 bridges and 55 tunnels; the path leads it through deep valleys, wild gorges and over the eternal ice of the Graubünden Alps.

The Tanzania-Zambia-Railway (Tazara) is one of Africa's most ambitious infrastructure projects; it connects the inland with the coast of East Africa and meant independence from the surrounding apartheid-ruled countries of East Africa.

In northern Argentina, the Tren a las Nubes or the cloud train, crosses dizzying viaducts and deep valleys; at an altitude of over 4000 meters, what was once the highest railway, runs past cactus forests and into the driest desert in the world.

The story of the world's most unusual and dangerous railways.

The Pamban Railway crosses the tropical landscape of Tamil Nadu, the former Madras, for around 600 kilometers.