EE WAS GREASING UNIVERSAL DRIVELINE ON LOCOMOTIVE, PUT LEFT HAND ON U-JOINT TO ROTATE DRIVELINE AROUND TO GREASE FITTING. (EE DIDN'T HAVE PARK BRAKE SET.) LOCOMOTIVE STARTED FREEWHEELING, GLOV E CAUGHT IN U-JOINT WHILE LOCOMOTIVE WAS FREEWHEELING, CAUSING REMOVAL TO TIP OF LEFT RING RINGER.