Earlier quoted context omitted.
When you think of an American state with a growing population you can take the existing infrastructure as a given and plan for rail for your new capacity. Unless you are willing to say we're just not going to add transportation capacity for our new citizens, you face a choice of road, rail, or air. Rail is often a good choice. As for "far apart" this seems irrelevant. Ohio has a greater population density than does S…
Where HSR excels is in being able to service several city pairs on a single line. The Northeast Corridor is a great example: you can have a single train service all pairs of {Washington, Baltimore, Philadelphia, NYC, Boston} at negligible extra expense in time and money. Thus you can add in stops like Providence, which don't generate all that many trips on their own, simply because it is literally on the way to where…
This strikes me as the main problem with the mindset around HSR. Consider e.g., Madison, Wisconsin.
Milwaukee would have a much more vibrant and dynamic ecosystem if undergrads/PhD students/professors could get to/from meetings with investors in MLK/CHI and be back for afternoon classes. Or continue internships/meetings during the school year.
There are enormous inefficiencies (and corresponding brain drain) caused by the fact that the region's center of innovation is 1+ hours by car away from the region's center of finance.
An MLK CHI Madison rail line would change the dynamics of the entire state's economy. Simply counting cars on the roads between those cities in the present ignores how HSR changes the entire dynamic in a very qualitative way.