EMPLOYEE WAS UNLOADING SALT FROM A RAILCAR AT THE UNLOAD STATION. LARGE CHUNKS OF SALT BEGAN TO BUILD UP IN THE UNLOAD CHUTE. EMPLOYEE USED A 1/2"" PIPE IN AN ATTEMPT TO DISLODGE THE SALT AND THE PIPE CAME INTO CONTACT WITH THE AUGER. WHEN THIS OCCURRED THE PIPE WAS FORCED TO THE NORTH AND THE EMPLOYEES RIGHT INDEX FINGER IMPACTED THE BOTTOM OF THE RAILCAR TRAP.