EMPLOYEE WAS IN THE PROCESS OF HOOKING THE SHOTCRETE RAIL CAR TO THE LOCOMOTIVE WITH A DRAW BAR AND PIN. THE PIN DID NOT HAVE THE RUBBER HOSE ON TOP TO GRASP AND EMPLOYEE WAS HOLDING PIN HEAD BY THE EDGES AND AS THE LOCI CAME FORWARD IT PINCHED HIS FINGER BETWEEN THE PIN AND HITCH ON THE LOCOMOTIVE. WAS NOT REPORTED SOONER, BECAUSE IT WAS BELIEVED TO BE A FIRST-AID CASE.