In 1947, the
Silver Comet was introduced by the
Seaboard Air Line Railroad (SAL) during the height of passenger rail use. Due to declining ridership, the
Silver Comet was downgraded in the 1960s, losing its sleeper-lounger cars. In 1969, the
Silver Comet was downgraded again and finally discontinued in June of that year, by SAL successor
Seaboard Coast Line (SCL). By 1986 SCL had gradually merged with several nearby railroads, forming the Seaboard System, which had become
CSX Transportation by July 1987. CSX abandoned of the former
Silver Comet route from Cobb County through Paulding and Polk counties in 1989. In 1992, the
Georgia Department of Transportation initially purchased the former roadbed for future use as a
high-speed transit route, but later that year, Ron Griffith, Director of Cobb County Parks, requested a lease agreement between the county and the Georgia DOT to use the rail line as a multi-use trail. The Cobb County Board of Commissioners approved the multi-use trail plan in November. Construction began in July 1998, with the initial section between
Nickajack Creek and Hicks Road opening by that November. The former
SAL/SCL right of way is rail banked. This means at any time in the future, if rail traffic increases to the point where an old line exists, it could be purchased and track put back down. The right of way would thus become a Class 1 railroad again. The former SAL/SCL line is 78 miles shorter than the line
CSXT now uses, the former
ACL, and Atlanta & West Point lines, which run well south of the former SAL/SCL line. In September 2019 the James M. Cox Foundation gave $6 million to the
PATH Foundation, which will connect the Silver Comet Trail to the
Atlanta Beltline. This project has been split into two parts. The PATH Foundation is responsible for the section from the current Silver Comet Trail terminus at the Mavell Road trailhead and then following the abandoned railroad right of way to Plant Atkinson Road. The Cobb DOT is responsible for the section from Plant Atkinson road to the Atlanta Road/Marietta Boulevard bridge over the Chattahoochee river, following an easement along Atlanta Road. Cobb expects to let its section for bid in Spring 2023. PATH's section is in flux due to legal challenges from railroad right of way easement holders. ==Economic impact==