Groping, grinding all too common on city's crowded trains

A young woman boards a crowded subway train in New York City. As more passengers pile in, a man inches closer and starts grinding his groin against her. The woman knows what's happening but the train is so packed she can't get away.

It's a situation police say plays out hundreds of times a year beneath the nation's largest city. With subway ridership approaching all-time highs, averaging 5.6 million daily riders, reports of sex crimes are also rising, up nearly 57 percent.