A number of people on my friends list have some familiarity with the German language. A much larger number have some familiarity with, and/or affinity for, London. Some of those might be described as "tube geeks". For the benefit of both groups, and the particular delight of the intersection of the two, I present this . I'd credit whoever it was who first linked to it, but I can't remember and I can't find the post. Thanks to filkerdave for the link.