Slightly related : I have discovered an hour ago this interactive map of Europe which lets you know, given your starting train station, all the destinations you

Slightly related : I have discovered an hour ago this interactive map of Europe which lets you know, given your starting train station, all the destinations you can reach directly without changing trains. https://direkt.bahn.guru/ https://direkt.bahn.guru/ (provided by Deutsche Bahn but not limited to their own trains)