EMPLOYEE STATED THE COAL CARS HAD COME OFF TRACK AROUND 3-SOUTH. AT THIS TIME AN AIR HOSE HAD BLOWN ON ONE OF THE 50 TON MOTORS THAT CAUSED IT TO BE TIED DOWN WITH A MANUAL BRAKE. AFTER ANOTHER MOTOR ARRIVED, THE EE WAS TRYING TO LOOSEN THE BRAKE THAT WAS TIGHT. HE WAS USING A JACK BAR TO TRY TO LOOSEN THE WHEEL WHEN THE BAR SLIPPED CAUSING HIS RT.4TH FINGER TO BE PINCHED.