Cute idea, breaking down all the major Shakespearean characters on various rail lines like "lovers", "warriors", "mothers" and so on. Bonus credit for the little icons, like having the sign for "Restaurant" over Titus. :)
Update: Some more links on the background history of the map:
The map is part of a branding campaign for the RSC and we'll soon see it on t-shirts, mugs, bags and so on.