As a frequent Tube user, I found this series both informative and insightful and not afraid to get involved with the engineering stuff going on behind the scenes. Best bit was when they had a group of engineers working on a set of points and couldn't get them going. When they got them working, only minutes before the line was due to open to the public in the morning, they had to admit they didn't know how or why the points had come back to life! They also showed the change over for Victoria Line stock, which is my local line, and I actually felt almost nostalgic for the 1967 trains (until I got to use one of the new ones, which go that much faster.)
I think they claimed that every day London Underground transport more people than the whole of the rest of the British rail network. Is that true?
Paul