The music producer concludes his four-part history of Britain's railways, focusing on the advent of diesel and electric services and the impact the notorious Beeching plan had on the map of the country's network. He also looks at what the future may hold with trains such as the Eurostar and Pendolino, and reminisces about his career on the tracks, from its beginnings in the year BR was formed to the train refurbishment company and fleet of locomotives he now owns