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Atlanta does have trains, and in fact has the 8th most annual riders of any US city, right behind the Bay Area.

https://en.wikipedia.org/wiki/MARTA_rail

I guess MARTA is between municipal and regional rail, sort of like BART. I meant for connecting the Atlanta metropolitan area to its region, not intraconnecting.

91,000 daily riders according to that link

2,000,000 daily vehicles on this Atlanta transit system

https://en.m.wikipedia.org/wiki/Interstate_285_(Georgia)

Roughly speaking the density of the US east of the Mississipi and the far west coast is dense enough. The rocky mountains and Alaska really bring our average density down.

It's unfortunate that passenger rail has deteriorated so much in the USA.

The city of Atlanta takes its name from the Atlantic railroad!