I was looking for a graph node map of Europe, using number of neighbor states, but a quick google provided no result (I am sure there are maps, just didn't find it by looking for Europe map + graph node) so this will have to do (it is major transport network nodes)
I am not sure why there is an intersection in Jutland, but no node. Should be Aarhus anyway.
Any idea which connections are included?
I wonder mainly because Frankfurt-Berlin and Marseille-Paris are missing. Dutch connections seem to be accurate (although a lot less direct than it appears).