INJURED EE WAS DISMOUNTING FROM CAB OF D-7. EVIDENCE INDICATES HE WAS NOT FACING THE EQUIPMENT AND DID NOT MAINTAIN 3-POINT CONTACT. HIS HSOE CAUGHT ON A SAW TOOTHED SAFETY STEP AND HE FELL AP PRO. 30 INCHES TO GROUND, TWISTING HIS KNEE. HE WAS RELEASED FOR MODIFIED DUTY, BUT HAS NOT RETURNED TO WORK.