On October 4, 2019, at approximately 11:10 a.m. EST, northbound Norfolk Southern Railway Company (NS) freight Train 187A103 (Train 1) derailed at NS Milepost (MP) 146.7 H on the NS Georgia Division, Atlanta Terminal District in Atlanta, Georgia. The method of operation is Traffic Control (NS Rule 261). The maximum authorized speed on the Inman Runaround Track is 35 mph for freight. Train 1 was traveling at a recorded speed of 7 mph when the train experienced a penalty brake application and later went into an emergency brake application after an unknown car derailed. Once the air pressure was restored on the rear, Train 1 began to proceed again before an inspection was performed which subsequently led to an additional 32 cars derailing. There was a total of 33 derailed cars that came to rest with a majority of the cars laying against an embankment. Two of the derailed cars were empty hazardous materials Chlorine tank cars.