The first diagrammatic map of London’s rapid transit network was designed by Harry Beck in 1931.[3] Beck was a London Underground employee who realised that because the railway ran mostly underground, the physical locations of the stations were irrelevant to the traveller wanting to know how to get to one station from another — only the topology of the railway mattered. This approach is similar to that of electrical circuit diagrams; while these were not the inspiration for Beck’s maps

Mark of Wandering Duck showed me this map that he found on Water Ways Songs:

Water Way Song's Canal Map

Water Way Song’s Canal Map

It is available on there site as a PDF, I have copied V1 and V2 here.

Its an good simple looking map, nbHacker will have to put one up in nbSteve.