VBZ Züri-Line Liniennetz Stadt und Region Zürich (1992), design concept by Anne and Hermann Eggmann (SGV/AGI)
this stylish diagram shows trams, city and regional buses, PostBus, AZZK buses, and S-Bahn; as well as indications of other railway operators, intercity train connections, and ferries. the front (right image) shows all lines with the s-bahn services condensed into a single black stroke, while the back (left image) shows detailed s-bahn services superimposed over a greyscale version of the front side.
see a higher res version on internet archive: link