Bit of an experiment really as it is work in progress and easier to upload to Vimeo and email it to various colleagues working on mining, visualizing and modeling our flow data on the London tube and overground rail system. What you see here are rank size distributions of flows at some 666 hubs or nodes defining the rail network at each 20 minute interval during the day. There are thus 72 rank size plots which start at midnight coloured white and change to red which is at midday, and thence back to white. We plot these first for entries, then exits from the stations, then the total volume. You can see the peaks at 8am and 5pm easily enough in this although the volume during the working day is only a little less than the peaks. Of the 666 hubs, the maximum in use are 627 and the lowest only 1 hub in the dead hours. The tube and overground stations are closed and this is an anomaly as someone probably swiped in or out despite.