It’s not that simple. For trains to be a complete solution you need walkable cities, and high density transport-oriented residential construction near stations.
This is almost diametrically opposite to parking-oriented cities and sprawling suburbia.
The best time for a city to invest in making their city walkable and public-transportation-able is decades ago. The second best time for a city to invest in making their city walkable and public-transportation-able is now.
Not everyone wants walkable. I'd much rather a remote first economy and cars. One of my hobbies is riding motorcycles on race tracks, I need a garage to store them, and a vehicle to tow them there. This is practically impossible in "walkable" cities.
90% of Japanese residents live in, essentially, a walkable megacity, and plenty of them ride motorcycles on the country's many tracks (which you would expect, since Japan houses several of the top motorcycle manufacturers). They don't have any issues participating in their hobby, and you wouldn't either.
Note that this holds without even having to mention that holding the ability for millions of people to be independent and mobile without needing to purchase and maintain a vehicle against a niche and expensive hobby is ridiculous. But there's no need to bring that up because we can have both.
Localities large and small have been moving towards higher density, walkable and transit oriented development for years now. It's happening, and it works.
Every time I attempt to read it, halfway through my brain flips into the mode that is normally reserved for when people start telling me that Ivermectin is a COVID remedy, or something equally farcical.
The comment you're replying to is not OK and I've replied to them to convey that. But the escalation and gudelines-breaking conduct in the thread began with you and was extreme. We need you to stop this style of commenting on HN and make an effort to observe the guidelines if you want to keep participating here. You've been warned before, and after enough warnings we have to ban accounts that keep commenting like this.
Please take a moment to remind yourself of the guidelines and make an effort to follow them in future.
This is almost diametrically opposite to parking-oriented cities and sprawling suburbia.