AvatarPRMAvatarAvatarNew York City has a secret subway line with antique cars — here's what it's like to ride itverified_publisherBusiness Insider - Ben GilbertThe New York City subway system is one of the most fascinating curiosities in a city full of mysteries. Miles of underground track shrouded in darkness, littered with abandoned stations and secret passageways — it's a common object of desire for the urban explorers among us. And, occasionally, New …