I think a Rail London map would be a cool idea, but pretty much impossible to do. So I figure, maybe if we had just the Underground (no National Rail) of Zone 1? Zone 1 is the most interesting part interchange wise and probably the only one that could be isolated as a map. Its hub thingy could be Kings Cross St Pancras with 6 lines, or the map could just not have one
It could work more than one way - when lines share a platform they could be kept as in the others, or split - if they were split it would be easier to get a line and harder to hop between trains.
It could be good to keep them though, as the circle line shares all of its platforms with other lines.
Any thoughts on the idea?