Chris continues his exploration of the world's most extreme railway lines. He attempts to cross the Andes, setting off from the coast of Chile and heading for the Bolivian capital of Sucre. Along the way he traverses some of the driest and most inhospitable environments on the planet, hitches rides on unusual trains and deals with altitude sickness at more than 3,000 metres.

In the last instalment of his interesting travelogue of extreme railway journeys across the world’s toughest terrains, presenter Chris Tarrant takes a trip through India on the Konkan line. The Konkan railway runs down the west coast of India, connecting the port cities of Mumbai and Mangalore. While the British built 40,000 miles of track across the vast sub-continent, they stayed clear of this narrow, boggy strip of land as it was deemed too treacherous and difficult to build on. As a result, western India remained undeveloped, until a brave Indian engineer took on the daunting task. Known as ‘The People’s Railway’, the line opened in January 1998, finally connecting the remote villages along the route to the outside world. Chris starts his journey at dawn in Mumbai, India’s financial capital and home to Bollywood. The ‘Mandovi Express’ is the first of many trains he catches along the 472miles of track running through the states of Maharashtra, Goa and Karnataka.

Chris journeys a thousand miles across Japan to find out if Japanese railways really are the best in the world. Along the way he meets one of the great architects of the bullet trains, a celebrity Station Master cat, a singing conductress and atomic bomb survivors who kept wartime trams running.

TV and radio presenter Chris Tarrant journeys by rail through some of the world's most challenging terrain, beginning with a trip from Bangkok in Thailand to Mandalay in Myanmar. Chris traces the route of the notorious Burma-Siam Railway, a 250-mile long line built by the Japanese during World War Two using enslaved Asian workers and Allied Prisoners of War, visiting the famous site of the Bridge on the River Kwai along the way.

The broadcaster returns, beginning by travelling across Europe to examine the train's role in the First World War. In Northumberland, he enjoys a ride on a preserved locomotive to find out how important the railways were to Britain for mobilisation of troops and the operation of large training camps around the country. Aboard a holiday train commandeered to transport troops and ammunition, Chris tells the stories of two opposing soldiers, one English and one German, who both took trains to the Somme in 1916.

Chris Tarrant is on a mission to cross three former Soviet republics entirely by rail in just one week.

Chris attempts to cross the length of Cuba, the only island in the Caribbean to boast an extensive railway network, from Havana in the west to the far east of the island.

Chris Tarrant travels on the historically Soviet Trans-Caucasus Railway, beginning in the Azerbaijani city of Baku before exploring the Geogian capital Tbilisi's vintage metro system, then a mountain rail bridge designed by Eiffel, and finally a tunnel reputed to be held together with egg yolk.

Chris travels through Turkey, reflecting on the achievements of Mustafa Kemal Ataturk - the founder of the republic who oversaw the modernisation of the country and its railways. He begins his journey at Istanbul railway station, the starting point ort he Marmaray rail tunnel, which passes beneath the Bosphorus and was built to withstand earthquakes. He also visits Ankara and the volcanic spires of Cappadocia, before heading deep into the mountains and ending in the remote borderlands city of Kars.

Chris sets out on a mission to visit all four corners of Ireland in just six days, on an ageing network that has seen better days. His journey starts in the south-west at Cobh in Co Cork and his first stop is Blarney Castle, where Chris kisses the famous stone, before he heads to the west coast to ride on an old local line saved by an eccentric local millionaire. He heads to Dublin to visit the jail made famous by the Easter Rising, before ending in Belfast, where he ponders what the future may hold for the railways and for Ireland.

Chris heads to the Alps to ride on six pioneering mountain railways. It’s the middle of winter, with snow and ice constantly threatening to derail his journey, as he crosses Austria and Switzerland on ever higher and higher railways to find out how and why these extraordinary lines were built. Along the way he faces some terrifying 19th Century winter sports and a climb up the North Face of the Eiger. Will Chris conquer the Alps? Or will they conquer him?

Chris embarks on a rail trip across Vietnam, exploring its French colonial history along the way, as he sets off along the Reunification Line from Ho Chi Minh in the south - to Hanoi in the north.

In Kenya, Chris explores the rapidly decaying “Lunatic Line” the most extraordinary railway project of the whole colonial era, that was famously troubled by mosquito infected swamps, hostile tribes, parched deserts and of course man-eating lions!

Boarding a train in Budapest, Chris takes a mid-winter trip through Transylvania in search of the truth behind the story of Dracula and to find out how well the region's railway networks - which were meticulously described in Bram Stoker's 1897 classic novel - survived. Along the way he visits a place that is claimed to be the world's spookiest wood, stops off at the birthplace of the gruesome Vlad the Impaler and heads to Bucharest to look at the vast edifices of dictator Nicolae Ceausescu.

Chris Tarrant traverses Morocco, heading for the Sahara.

Chris Tarrant embarks on a journey across Ukraine, where he meets a soldier from the ongoing civil war and visits Chernobyl.