Georgia public transport is shaped by racism and class politics. When Atlanta first started building MARTA, Cobb county didn’t want it so they established a 300 foot wide township that ran along the border of Cobb and Fulton counties. The only law this township had was that no public transit could be constructed in it. The township effectively blocked MARTA from reaching into Cobb county.
Why did this happen? Because when civil liberties came to be Atlanta experienced a “white flight” where white people moved in large numbers out of the city. Most of the white flight landed in Cobb county and wanted to keep black people out.
That’s one of the major hurdles that mass transport has had in Atlanta, there are plenty of others.