The Tennessee Valley Railroad Museum (TVRM) is based in Chattanooga, Tennessee and was founded as a chapter of the National Railway Historical Society in 1960 by Paul H. Merriman and Robert M. Soule, Jr., along with a group of local railway preservationists who were concerned with saving steam locomotives and railway equipment for future historical display and use. Today, TVRM continues to run trains, showing people what it was like in the golden age of railroading, and has started local freight service. Visitors can also take a one-hour 6-mile (9.7 km) round-trip ride, which is typically pulled by a steam locomotive. 

TVRM has a full working locomotive and car repair shop complex, Soule Shops (named after co-founder, Robert M. Soule, Jr.), capable of handling even the heaviest repairs. In March 2011, TVRM completed restoring Southern Railway Ks-1 class 2-8-0 630 to operational status. In September 2014, TVRM completed the second restoration of Southern Railway Ms-1 class 2-8-2 4501 for another excursion career with Norfolk Southern's 21st Century Steam Excursion Program. At present, one locomotive is under restoration to operational status: Southern Railway E8A 6914. 630's 10-year-long restoration was the most extensive restoration ever performed at TVRM, as well as one of the most extensive steam locomotive repairs in the United States since the end of steam on the railroads (information coutesy of Wikipedia)

This video records the restored Southern 4501 on on of its Mission Ridge local runs in March 2015.