> If the population exceeds 10M then the current rail and road infrastructure will not handle it well.

Actually it will do just fine. Maybe if the very party who is proposing this wouldn't have spent 20 years preventing infrastructure improvements it would handle it even better. Maybe if this very same party wouldn't continue to fight sensible transportation choices at every turn. Maybe if this party wouldn't spend endless time and energy trying to put as much money as possible in unpopular and irrational highway expansion projects.

There are lots of easy upgrades we can do to our transportation infrastructure. For example, Zimmerbergtunnel 2. This was known to be needed since the early 90s, and was planned. But was not done and is now in planning. We did it in 2 stages, making it much, much more expensive. But in the same period we spend as much as we did on Zimmerbergtunnel 2 on highway expansions that have lesser returns.

> And it's almost impossible to significantly improve the throughput of rail and autobahn without extreme projects.

Well we should get moving on some extreme projects then, or maybe not have the party that proposing this constantly stand in the way of sensible polices.

Anybody who seriously thinks about this will realize having new high speed line across the country would be great. But they would never let that happen.

NEAT was an extreme project, and it will provide benefits for centuries.