EMPLOYEE STATED THAT HE WAS ATTEMPTING OT RE-RAIL ON OIL CAR AND A ROCK DUST CAR WITH A 20 TON LIFTING JACK. THE JACK WAS EXTENDED, INJURED STATED THAT HE HIT THE QUICK RELEASE WHILE HOLDING THE TOP OF THE JACK. THE TOP OF THE JACK DROPPE AND SMASHED HIS RIGHT MIDDLE AND RING FINGERS.