A Big Apple straphanger was stabbed multiple times on a Queens train Saturday afternoon — with the crazed attacker still on the loose, cops said. The 33-year-old male victim was riding a Manhattan-bound J train passing through the 111th Street station in Corona around 3:36 p.m. when an unidentified woman knifed him twice in the thigh, according to an NYPD spokesperson. The subway rider was rushed to Brookdale Hospital and is in stable condition, police said. Peter Gerber for New York Post The rampaging suspect — believed to be about 30 to 40 years old — fled the train, and the victim reported the attack to police after getting off at the Norwood Avenue station in Brooklyn. The subway rider was rushed to Brookdale Hospital and is in stable condition, police said. It’s unclear which stop the woman fled, what weapon was used in the stabbing, or what sparked it. No arrests have been made. Peter Gerber for New York Post No arrests have been made. The attack is under investigation.…