Railway historian Tim Dunn once again teams up with the London Transport Museum’s Siddy Holloway to explore the history of the London Underground in their second series for Yesterday TV.

And this time there are 10 episodes to watch – compared to the six episodes in the first series, so more tubes to look at, all starting next Thursday (5th May).

In the first episode of the new series, the two learn how the modern Underground functions while at the Museum’s depot, they root through the archives, unveiling documents, photographs, films and artefacts that have never been seen before. Tim and Siddy also get to explore the disused Jubilee line areas of Charing Cross station, now more famous as a film location, and walk down the service tunnels that were dug under Trafalgar Square to help with the Jubilee line’s construction. Meanwhile, as Siddy walks the Kennington Loop, back at the depot in Acton, Tim looks at some original plans for other loops elsewhere on the network.

Charing Cross tunnels – Secrets of the London Underground (c) Yesterday TV

In the second episode, Tim and Siddy discover the hidden world of the Waterloo & City, the only line entirely underground, taking a walk down part of the tunnel towards Bank station. Later Siddy explores abandoned Mark Lane, by the Tower of London. Also, at the Acton depot, they rifle through the London Transport Museum’s collection of unscanned photos before Tim learns about the Underground’s moquette.

Waterloo and City line – Secrets of the London Underground (c) Yesterday TV

Episode 3 – King William Street and Knightsbridge: Tim and Siddy visit King William Street, the earliest disused station on the deep tube. Siddy also sees new life breathed into Knightsbridge’s long-abandoned lifts.

Episode 4 – Brompton Road and St Pauls: Tim and Siddy walk the Piccadilly line at night to explore the hidden World War 2 remains of Brompton Road. Siddy reveals the unexpected wartime use for St Pauls.

Episode 5 – London Bridge and Ongar: Tim and Siddy explore the disused parts of London Bridge. Siddy visits Ongar in Essex, and nearby Blake Hall which, at the end, served less than 20 passengers a day.

Episode 6 – King’s Cross and Marlborough Road: Tim and Siddy explore Kings Cross St Pancras, including a secret siding and the disused Thameslink station. Siddy also discovers long lost Marlborough Road station.

Episode 7 – Elizabeth Line and Angel: Tim and Siddy explore the brand new Elizabeth Line – and have access to 2 of its stations weeks before the line opens. Siddy also explores the disused parts of Angel.

Episode 8 – Quainton Road and Kingsway: Tim and Siddy visit Quainton Road in rural Buckinghamshire, 50 miles from central London – and once on the underground. Siddy also explores Kingsway tramway tunnel.

Episode 9 – Greenwich and Notting Hill: Tim and Siddy visit the cathedral-like Greenwich Power Station, which stands ready to power the tube at short notice. Siddy visits hidden parts of Notting Hill Gate.

Episode 10 – Baker Street and Edgware Road: Tim and Siddy explore the tube station with the most platforms, Baker Street. Siddy visits the disused Edgware Road Signal Cabin with its very last operator.

The first episode of the second series is on Thursday 5th May at 8pm on Yesterday, and each episode will follow at the same time on subsequent Thursdays, repeated on the Fridays at 9pm.

Freeview 26 | Sky 155 | Virgin 129 | Freesat 159 | YouView 26 | UKTV Play

The first series of Secrets of the London Underground launched to a record-breaking 659,000 viewers, with the opening episode becoming Yesterday’s biggest ever launch of a new series, the channel’s highest-rated programme ever and the 2nd highest rating non-terrestrial programme of the day.


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  1. Maurice Reed says:

    Great stuff!

  2. Dave Cross says:

    I’m in two minds about this. I love content about the Underground but I wish they had found a couple of presenters who were more engaging. I watched all of the previous episodes, but it was often a bit of a struggle.

    I wish Yesterday had offered Geoff Marshall a contract instead of Tim and Siddy.

    • John Airey says:

      I can’t agree. As much as I love Geoff Marshall and what he does I think Tim and Siddy bring real enthusiasm to the subject. It would however be good to see Geoff on the show for some of the knowledge he has. Although obviously the show acts like a teaser for the hidden London tours which make money for the London Transport Museum.

    • Derek Smith says:

      Agree with you there. Geoff’s enthusiasm for the subject tempered with humour certainly keeps me watching his You Tube channel. I do find the pair doing this series to be a bit ‘breathless’ with their presentation, which distracts from the subject matter.

  3. Brian Butterworth says:

    As some who has read extensible on the topics this show covers, I find that the access Siddy and Tim each show is a joy of new actual information, rather than going over old news.

    I almost cried at being allowed to LINGER on old blueprints of stations and equipment – finally being treated as someone who has an Engineering Drawing qualification and might actually want to give them the once-over!

    Didn’t Geoff Marshall used to be employed the the BBC (owner of “Yesterday”) anyway?

  4. Douglas Martin says:

    Unfortunately, I guess this is completely unavailable to people in the US?

  5. Richard says:

    I don’t see why you would think it is UK only. https://uktvplay.uktv.co.uk/shows/secrets-of-the-london-underground seems to let you watch the first series (once registered) so I presume the second series will appear after broadcast.

    • Douglas Martin says:

      When I have tried, it directs me to download an app, which is not available in the US. Are you in US?

    • Andy T says:

      Have you tried a vpn browser, it works for me to play South Park episodes, that I wouldn’t be able to play from the UK. Probably not too hard to figure a way of registering if it works ok 😉

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