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 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.

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!