CL 121 WAS HEADING SOUTH WITH 1 LOCOMOTIVE 2304 AND 7 LOADED HOPPER CARS OF CORN. ENGINEER WAS OPERATING AT 22MPH AS TRAIN CL121 APPROACHED THE CROSSING LOCATED AT E.1090 CROSSING # 671297J. TRAIN CL121 WAS SOUNDING HORN IN PROPER SEQUENCE AND TIME AS IT APPROACHED THE CROSSING. A HIGHWAY USER FAILED TO YIELD AT THE SIGNAGE AND ENTERED THE CROSSING WHERE THE VEHICLE WAS STRUCK BY THE LOCOMOTIVE.NO INJURIES WERE REPORTED AT THE INCIDENT LOCATION. IN BLOCK 32 CODE 11 (YIELD SIGNS) IN ADDITION