EE was assisting coworkers unloading a section of stage loader off the rail car. When the scoop winch was engaged the chain clevis connected to the scoop cable winch broke allowing the winch cable to fly back striking the EE on the left shoulder, neck & face. Both the Federal (MSHA) & State (WVOMHST) were notified in a timely manner. EE was treated & released from the ER.