On September 25, 2019, at approximately 2:59 p.m., CDT, a southbound CSX freight train M97225 (Train 1) derailed at CSX Milepost (MP) J22 on the CSX Nashville Division, Chattanooga Subdivision in Smyrna, Tennessee. Train 1 was making a shoving movement with 85 loaded autoracks at a recorded speed of 6 mph when the train coupled with a boxcar at an excessive speed, which caused the 33rd autorack in the train to derail. The Engineer and Conductor were unaware of the derailed equipment and proceeded northbound causing 31 additional autoracks to derail.