Location of TEN-T corridors crossing mountain massifs — European Environment Agency
TEN-T is the Pan-European transport network. It's made up of roads, railways, inland waterways and short sea routes which create 9 European corridors connecting 424 cities with ports, airports and rail terminals :
Scandinavian–Mediterranean Corridor - Wikipedia
TEN-T corridors | ITRANSPORTE
For completion, TEN-T networks needs EUR 500 billion