Secrets of the London Underground returns next week

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 thro