The accused in an apparently berserk stabbing attack with an ice pick on the subway Monday has been identified by police as Thomas Sommerville, 27, of Toronto. It all occurred as a train was arriving at College Station about 12.40 p.m. A man produced an ice pick and attacked another person who appears to have been a total stranger. The victim, 60, was taken to hospital with face wounds as witnesses struggled with the stabber until police could subdue him.