A London based DJ named Santero posted the original image above on Reddit, so I asked if I could use it to visualize tube lines. I had seen a similar design for Paris, but not London. The resulting design was retweeted by DJ Santero and went viral for a bit from that point on. It was featured in CityLab, Mashable as well as some local newspapers.
I was later commissioned to create similar visualizations for six more cities, which can be found here: https://www.cashnetusa.com/blog/aerial-oldest-metro-systems/