Last week, while I was searching for some images and I found this video. I made it a couple of years ago in my first visit to the London Transport Museum in Covent Garden.
Even though, the London Underground network has kept growing since 2008, I think that the video is quite interesting. It shows the evolution of the underground network employing the diagrammatic language of its map. The video also gives an overall of the complexity of the network at the end of the period.
I should update the video including the current layout of the network!