TRAIN K39-18 MADE CONTACT WITH A TRACTOR AT MP92.8 ON THE MASON CITY SUBDIVISION. NO INJURIES WERE REPORTED FROM THE CREW OR THE OCCUPANT OF THE TRACTOR. NB AGRICULTURE TRACTOR APPROACHING CROSSING. TRACTOR CAME TO A STOP BUT FOUL OF THE TRACKS. TRAIN MADE CONTACT WITH THE COUNTERWEIGHTS ON THE FRONT END.