The mangled body of a nearly naked young woman was found on the tracks near a Brooklyn subway station Sunday – and her prosthetic leg was discovered a few feet away. The woman’s body was found about 3:40 p.m. in a subway culvert about 100 feet from the Kings Highway station on the N line in Bensonhurst. “I heard one of the workers screaming on the radio, ‘A woman’s body on the tracks!’” said Matt Bencivenga, a dispatch manager for a car service company nearby. “She was all mangled.” The woman, who was wearing only black panties, was apparently struck by a train. Besides knocking off her prosthetic leg, the impact severed her hands, authorities said. Police said the woman’s death was not suspicious, suggesting it might have been a suicide. Even so, witnesses were spooked at the gory sight. “We feel scared,” said Anna Berrezveta, 35. “We see the body. We see the blood, everything.”