The Architecture the Railways Built Season 4 - Episode Guide, Ratings & Streaming

Tim heads north of the border to scale a Scottish railway icon – the Forth Bridge, without doubt one of the engineering wonders of the world. Tim conquers his fear of heights to learn its story from its foundations, deep under the Firth of Forth, to its summit 110 metres above the water. At Goathland, North Yorkshire, is a railway station where movie magic was made, possibly better known today as Hogsmeade from its starring role in the Harry Potter films.

In Manchester’s Castlefield area, Tim discovers how viaducts still dominate the cityscape. In Reading, a railway station is transformed and ready for the commuter challenges of the 21st century.

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 gets to grips with his local station – London Bridge, meeting the architects who turned this one-time Frankenstein’s monster of a station into the bright, airy and tranquil modern terminus. At the National Railway Museum, Tim gets access to Borough Market Junction Signal Box.

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.

Tim explores railway ingenuity at Goole swing bridge in Yorkshire and takes in Edinburgh Waverley from roof to underground vaults. At the National Railway Museum learns how railways demarked their land.

Tim Dunn discovers how two competing Victorian railway companies shaped the city of Lincoln.

Tim Dunn revisits his childhood holiday haunts in South Devon, following the route of Brunel's experimental atmospheric railway.

Tim Dunn explores the birthplace of British locomotive manufacturing - Leeds, starting at the Round Foundry.

Tim Dunn explores beautiful Hull Paragon station and finds out how Royal Leamington Spa got a wonderful art deco station.