The Victorians' private compartments, rugs and foot warmers may have made way for air-conditioned carriages with airline-type seating, but parts of Britain's railway system remain the oldest in the world. Referring to his lauded book, The Railways, Simon reveals a tale of technological achievement, of shifting social classes, of safety and crime, of tourism and the changing world of work - showing us that to travel through Britain by train is to journey through time.