Atlantic & Gulf Short Line Railroad The 20-mile Midville, Swainsboro & Red Bluff Railroad became the Atlantic & Gulf Short Line Railroad around 1905. In 1906 it was sold to the new Georgia & Florida.   RailGa.com. Georgia's Railroad History & Heritage. © Steve Storey. Railroad History | The Depot List | Locomotives On Display | Odds & Ends | Sources & References | Home