Earlier quoted context omitted.
The thing about ultra-high-speed is this: your benefits (travel time) grow linearly with speed, but your problems (energy, capacity, curve radii, etc.) grow quadratically. Actually, it's worse than it sounds. Travel time has a big impact on demand--but only within a small-ish window, about 2-4 hours. Outside of that window, demand does not respond that much to changes in travel time. That means that higher speeds are…
There is an eaisier question. Is it better to have more ambulances or faster ambulances. Faster wins every time. Analogy is a terrible argument. But I kinda think faster transportation beats more transportation every single time.
Probably better to have more ambulances overall, and maybe a few ultra fast ones (e.g. helicopters) for time critical situations.