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Apr 21, 1:02 PM EDT

NY subway service inches back on; power outage cause unknown

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AP Photo/Barbara Woike

NEW YORK (AP) -- Con Edison and transit crews are working to determine what triggered an hourslong power outage that caused major subway delays in New York City.

The Metropolitan Transportation Authority says the power went out around 7:30 a.m. Friday at 53rd Street and Seventh Avenue in Manhattan.

MTA spokesman Kevin Ortiz said some passengers were stranded on trains, and some cars were dark except for phone lights.

Some riders say their commutes took two or three hours. Stations were packed.

Generators restored some power by lunchtime. "B'' and "D'' service was inching back around 11:30 a.m. But residual delays continued.

The MTA cited "a Con Edison power issue." But utility spokesman Bob McGee said the cause hadn't been pinpointed and Con Edison isn't the only power source there.

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