UPPER WEST SIDE, Manhattan (PIX11) -- Since the 1930s, there have been air shafts on the ground in Riverside Park, each covered with a heavy metal grate, every dozen or so yards, for some 30 blocks.

In the last few days, those grates have had metal signs attached to them reading "Danger" and warning about the risks of standing on the grates. The fact that those signs have suddenly appeared is raising concerns that the danger being warned about could be far more than just a word of caution.

"I noticed the signs," said Anita Bergman, a frequent parkgoer who was in Riverside Park walking her dog. "I wondered if maybe something happened that we weren't

aware of," she continued, "or if there is a reason for this."

The airshafts that the grates cover provide ventilation for an Amtrak rail tu

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