> Cars don't scale infinitely but are also way more flexible than rail lines could ever be
I'm not convinced this is true. Because a train enables more density, it enables more places you can reach once on it. A car enables more geographical area, but there is a lot less things to do in that area, and those things to do are what matters. If you want to go camping miles from anyone else than a car will get you there, but if you want to do a city activity (restaurant, movies, live music, show, work) a train can get you to a much greater variety of those things.
Note that with both the real question is the network. A car where there are not roads won't get you anywhere. A car where there is one road doesn't get you far. Same for a train - I live in a city without a train and so obviously I can't get anywhere on it. I've been in cities with trains and I was able to get places on it - enough that I didn't need to have a car.
I'm not convinced this is true. Because a train enables more density, it enables more places you can reach once on it. A car enables more geographical area, but there is a lot less things to do in that area, and those things to do are what matters. If you want to go camping miles from anyone else than a car will get you there, but if you want to do a city activity (restaurant, movies, live music, show, work) a train can get you to a much greater variety of those things.
Note that with both the real question is the network. A car where there are not roads won't get you anywhere. A car where there is one road doesn't get you far. Same for a train - I live in a city without a train and so obviously I can't get anywhere on it. I've been in cities with trains and I was able to get places on it - enough that I didn't need to have a car.