AT APPROXIMATELY 0825 HOURS, THE LBOS STRUCK A TRACTOR TRAILER DURING A SHOVE MOVEMENT OUT OF ARKEMA. THE CREW REPORTED THE 18 WHEELER WAS STOPPED AT THE CROSSING THEN PROCEEDED ATTEMPTING TO CROSS. THE CREW FAILED TO STOP AND PROTECT THE CROSSING RESULTING IN THE TRAILER BEING STRUCK. THE DRIVER OFTHE 18 WHEELER DID NOT STOP AND DROVE OFF SO DRIVERS AGE IS UNKNOWN.. POLICE DID NOT SHOW UP AS SAID IT WAS PRIVATE CROSSING.