Transit Police are seeking a Quincy man accused of indecently assaulting a woman on a Red Line train two weeks ago, authorities said Thursday. John Nardone, 26, allegedly committed the assault at 6 a.m. on May 31, MBTA Transit Police said. Nardone exited the train at the Quincy Center station, police said. Police described him as 5-feet-7 and weighing 185 pounds, with an “Italy” tattoo on his left calf and a tattoo of a cross on his left forearm. “Detectives are anticipating the arrest of Nardone,” police said.