ATLANTA — Amtrak could add bus routes to cities located near, but not along, its Crescent route, which the railroad believes will increase “ridership and revenue while expanding the reach of the intercity passenger rail network,” the railroad said in a recent report. Such bus routes would connect the Atlanta Amtrak station with Macon, Ga.; Columbus, Ga.; Dalton, Ga.; and Chattanooga, Tenn.; the railroad indicated. Amtrak estimates annual ridership on the routes would exceed 17,000 passengers and result in a net revenue of $600,000 per year. The bus service is just one of several upgrades the railroad is considering making