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For a "network map" I'd hope to have something that showed which routes services ran on. An international version of that would be really cool.

This is basically the transit or ÖPNVKarte layer on https://www.openstreetmap.org/.

But that data is less complete and only shows route names at high zoom levels

data-wise this could be possible. I know at least in Germany, there is also data in OSM about each line and which tracks they are using.