Tim goes deep beneath the waves to explore the Channel Tunnel, stopping off at Ashford International to take in this underappreciated piece of 90s railway architecture. Folkestone Harbour Station, once a great hub for international travel, is leading the way for the regeneration of a whole area of the town.

Tim visits the striking post-war Coventry station.? In Scarborough he discovers the birthplace of Britain's funicular railways.? And in a TV first, Tim delves into Network Rail's archives.