POLICE VEHICLE: IN PURSUIT OF ANOTHER VEHICLE AT 40MPH. BOTH DRIVER& PASSENGER WAS PROPERLY BELTED. CROSSED RAILROAD TRACKS WHICH WERE RAISED, DUGGED UP & PAVED OVER. DRIVER LOST CONTROL & WENT INTO A DITCH, FRONT END FIRST. VEHICLE PROCEEDED TO ROLL END TO END FIRST & THEN CORNER TO CORNER THREE (3) TIMES. PASSENGER IN THE FRONT WAS EJECTED THROUGH DOOR WHICH HAD CAME OPEN. SEAT BELT BUCKLE MECHANISM HAD RELEASED THE BELT. DRIVER REMAINED BELTED IN VEHICLE. PASSENGER SUSTAINED A TORN ANKLE/ LEFT KNEE/SPRAINED SHOULDER & SUPERFICIAL CUTS & BRUISES. DRIVER SUSTAINED SUPERFICIAL CUTS & BRUISES. *AK