Tim Dunn follows his family roots by exploring the architecture in Metroland to the north west of London. He also sees the ornate Great Malvern station and its secret "Worm" passage and he experiences the extraordinary Glacier Express in Switzerland.

Tim Dunn rides up Mt Snowdon's railway to visit the summit station. He also explores the world's largest mechanically operated signal box and discovers how a glass structure envelopes Strasbourg's 19th century station.