WASHINGTON — The National Transportation Safety Board is investigating an injury to a CSX conductor that occurred Thursday, Aug. 6, in Fairburn, Ga., the agency has announced. The incident occurred at a Coca-Cola facility, the NTSB said. The parties involved are limited in their ability to comment while the incident is under investigation. A CSX spokesman said the NTSB is on scene and CSX personnel are supporting the investigation and cooperating fully with regulators. Fairburn is about 20 miles southwest of Atlanta.