Chris Tarrant: Extreme Railways

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!

Chris arrives in Mombasa to follow what was surely the greatest railway endeavour of the entire colonial era - the so-called Lunatic Line. His plan is to follow the now-crumbling line right across Kenya to the shores of Lake Victoria, discovering how the constructors overcame obstacles in their bid to make East Africa part of the British Empire.