Michael Portillo takes to the tracks with a copy of George Bradshaw's Victorian Railway Guidebook. In a series of four epic journeys, he travels the length and breadth of the country to see how the railways changed us, and what of Bradshaw's Britain remains. His journey takes him from Buxton along one of the first railway routes south to the capital, London. This time, Michael visits the oldest working factory in the world at Cromford, explores the country's first public park in Derby and finds out why Burton's beer is said to be the best.