It’s really not that simple. If Denmark population 6 million people and 141 people per/km^2 has zero issue with trains then Florida a flat state population 22

It’s really not that simple. If Denmark population 6 million people and 141 people per/km^2 has zero issue with trains then Florida a flat state population 22 million population density 163/km^2 should be full of them. And it’s not alone. MD has 6 million people and 246/km^2, Massachusetts 7 million 347/km^2, New Jersey 9.3 million and 488 people / km^2. Further, if you consider the road network the overwhelming majority of roads are in high populations density areas. NYC alone has ~1/6 as many road miles as the entire interstate highway system which criss cross the US. https://en.wikipedia.org/wiki/Interstate_Highway_System https://en.wikipedia.org/wiki/Interstate_Highway_System It’s a classic edge to surface area problem, 10,000 acre farms need 1/100 the roads per acre as 1 acre suburban homes. The same kind of scaling applies to rail networks.