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The new grates were designed with slip-resistant surfaces and feature only a half and inch of space between cross bars, the MTA said.
The grates are "sure to keep wearers of high-heeled shoes safe and happy," the MTA said in a press release.
The new ventilation facility will provide ventilation for the tunnels under Park Avenue that will carry Long Island Rail Road trains into East Side Access, a new train station being built under Grand Central Station that is the largest transportation infrastructure project in the United States.