Vandalism is suspected in the derailment of a CSX freight train near Franklin in September.
The Virginian-Pilot reports that CSX cited vandalism as the primary cause on an accident form it filed with the Federal Railroad Administration.
A spokeswoman for the agency says the railroad reported objects placed on track and a thrown switch.
A CSX spokeswoman says the railroad is cooperating with an FBI investigation. Two employees injured in the derailment are recovering.
Two locomotives and nine freight cars derailed on Sept. 19.