I am pretty sure this thread of mine won't get 1100 retweets like this ridiculous load of squiggles on a map, but here goes...
- start by identifying the centres of population that have massive transit between them, and rail has a low market share, and work out how to fix that. Examples: Ruhr or Frankfurt - London, Frankfurt - Paris, Amsterdam - Paris
- good luck sticking a 300km/h railway through the places on that map! The inhabitants will *scream*!
- Make freight trains longer, and quieter.