Further proposed projects to investigate

[traines-source]

• Bahn2000
• NEAT: Gotthard/Ceneri/Lötschbergtunnel
• ABS/NBS Karlsruhe-Basel
• all sorts of tram projects (e.g. Paris T10)
• prolongement Paris Métro ligne 1 Val de Fontenay, ligne 11 est
• Paris RER E
• Berlin U-Bahn extensions
• Berlin S21
• Karlsruhe Kombilösung
• Rail Baltica
• Feste Fehmarnbeltquerung
• Koralmbahn
• Semmeringbasistunnel
• Turin - Lyon
• Poland High Speed Lines
• Spain High Speed Lines
• Line 9 of the Barcelona Metro
• Line 11 of the Madrid Metro
• Västlänken in Gothenburg
• Rennes Métro Ligne b

[mszekiel]

Idk if that's something viable to add, but maybe: https://bauprojekte.deutschebahn.com/p/angermuende-stettin

[traines-source]

I have so far avoided these pure Ausbau/upgrade projects. But maybe we could introduce a sort of filter or categories on the website. Still, I guess it will be quite difficult to obtain figures like passenger numbers for these kinds of projects.

[SpaceFrags]

Maybe consider the Italian High Speed Rail projects also?

• Turin - Venice New HSR Line
• Verona - Brenner New HSR Line
• Milano/Turin - Genoa New HSR Line (Terzo Valico dei Giovi)
• Naples - Bari New HSR Line
• Naples - Reggio Calabria New HSR Line
• Strait of Messina Bridge New HSR Bridge
• Messina - Catania - Palermo Upgrade HSR Line

Also some Metro/Tram Projects

• Line 4 of the Milan's Metro
• Florence New Tram Network
• Bologna New Tram Network