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