A teenage boy narrowly escaped death Saturday night, when he fell from a train while subway surfing inside an underground Queens station, police said. The 16-year-old tumbled off the top of a northbound F train inside the Briarwood subway station and landed on the platform around 8:52 p.m, according to cops. Medics took him to Jamaica Hospital Medical Center where he was listed in stable condition with leg injuries. “It wouldn’t be the first time,” a police source said about daring teen’s subway surfing below ground.The dangerous incident comes days after a 15-year-old boy sustained head injuries while subway surfing in the Bronx.Last year, six people died trying to perform the reckless stunt. ...