I WAS ATTACKED BY AN EMOTIONALLY DISTURBED PERSON ON A NEW YORK CITY SUBWAY TRAIN. (CHOKED AND HEAD REPEATEDLY SLAMMED ON A METAL POLE) THERE WERE NO OFFICERS ON THE TRAIN OR ON THE PLATFORM AND I HAD TO WAIT FOR OFFICERS TO RESPOND BEFORE HE COULD BE ARRESTED. I HAD A MILD HEAD INJURY AND ABRASIONS TO MY NECK (PICTURES WERE TAKEN BY THE POLICE). IS THE MTA LIABLE FOR NOT HAVING ANY SECURITY PRESENT?