In this episode, Chris embarks on a thousand mile journey across Spain’s complex railway system, from Gibraltar in the far south to Bermio on the north coast, deep in Basque Country. Travelling on an extraordinary range of different trains and types of track, he’s on a mission to find out how Spanish railways evolved from some of the most backward in Europe to the most advanced and innovative in the World, through one and a half centuries of stormy history, including the Civil War and four dark decades of the Franco dictatorship.