EE HAD COUPLED RR CAR AIR HOSES TOGETHER IN PREPARATION TO SWITCHING OUT CARS. HE THEN TURNED OPEN THE AIR VALVE TO CHARGE AIR LINES FOR BRAKING. ONE OF THE COUPLINGS FAILED CAUSING THE AIR HO SES TO SEPARATE IN VIOLENT MANNER. ONE HOSE STRUCK HIM ON THE LEFT ELBOW AND HIS BEEN DIAGNOSED AS A SPRAIN. ANTI-INFLAMMATION MEDICATION AND LIGHT DUTY ARE THE RESULT FOR NOW. CONTINUES TO O