Secrets of the London Underground returns for an enthralling fourth series, presented by railway historian Tim Dunn and Siddy Holloway from the London Transport Museum.
This season, Tim and Siddy uncover hidden histories at iconic stations like Paddington and Waterloo, revealing surprising pockets of the past alongside modern developments. They also gain exclusive access to South Kentish Town, an abandoned station closed to passengers over a century ago.
The pair delve into the archives at the London Transport Museum depot, meeting the people who bring the Underground’s history to life. Highlights include a busker, a poet, a volunteer restoring an old signalling machine, and a tunnel engineer shaping the future of the Bakerloo line.

In the season opener, Tim and Siddy explore Earl’s Court station, a pivotal interchange on the Piccadilly and District lines known for its innovative spirit. Earl’s Court was the first to install a passenger escalator and automatic lifts. Today, it continues to evolve with redesigned walkways that complement its iconic glass roof.
Siddy also visits Alperton, showcasing the futuristic 1930s design by famed architect Charles Holden. Behind a locked door, she uncovers a legendary escalator originally built for the Festival of Britain.
At the museum depot, Tim is shown the restored workings of a 1930s platform indicator, a fascinating piece of telegraph technology used to display train destinations.
Don’t miss the premiere of Secrets of the London Underground as it journeys through the captivating, lesser-known stories of London’s iconic transport system.
Tuesday 2nd July, 8pm on Yesterday and if you’ve missed any of this incredible series then catch up via UKTV Play
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