Crews successfully finished moving early Wednesday the chemical butadiene from the train derailment site in southwestern Jefferson County. The butadiene has been delivered to a rail yard, according to MetroSafe.At 7:30 a.m. Wednesday,crews began working to work on car containing another dangerous chemical, hydrogen fluoride, MetroSafe said. MetroSafe said the "trans-loading" -- moving from the wrecked cars to others to get the chemical from the scene -- has gone well and no HF vapors have been detected in the work zone.(Five things to know about hydrogen fluoride.)Dixie Highway will remain closed until the work is complete. Also, an evacuation of a half-mile radius around the derailment site -- near Dixie Highway and Katherine Station Road -- continue, as well as air restrictions.