THE EE WAS ASSISTING IN INSTALLING A CONTROL TRANSFORMER IN THE ROOF DRILL CONTROL PANEL LOCATEDIN THE OPERATOR'S DECK. TRANSFORMER WAS IN POSITION WHEN THE EE WAS REPOSITIONING HIS BODY TO BO LT THE TRANSFORMER IN, THE TRANSFORMER ROLLED OUT OF POSITION AND FELL ONTO EE'S LEFT HAND, STRIKING HIS INDEX FINGER.