Chris Tarrant takes us on a series of extreme railway journeys through the World's toughest terrains... This series sees TV legend Chris Tarrant embark on a series of adventures as he travels around the globe to experience the world's most extreme trains. Chris is thrown in the deep end, as he finds himself stuck in the heart of an African jungle, crossing the Australian Outback and exploring the Monsoon Coast of India by train. Chris meets the drivers, engineers, local characters and of course his fellow passengers as he finds out how these extreme railways were built, how they're kept running and how they change the lives of the local people they connect to civilisation. But most of all he experiences full on the highs and lows of some unforgettable journeys.