About 4:42 a.m. on March 22, 1983, 13 cars (3 tank cars and 10 boxcars) of Illinois. Central Gulf Railroad Company train SML-4-21, 1st No. 64, engine 702, derailed in a 2 left curve at Fort Knox, Kentucky, while moving about 28 mph over an excessively worn, badly shelled rail which tipped and broke. During the derailment, two tank cars containing chloroprene overturned, and chloroprene began leaking from a dome valve of one of the cars. At 9:00 a.m., three E. I. DuPont hazardous material experts from Louisville, Kentucky, arrived at the derailment site. About 9:45 a.m., the leak was stopped Evacuation of the area was not necessary. There were no injuries as a result of the accident. Damage was estimated at $199,831.