A power failure plunged a stretch of the West Side of Manhattan into darkness on Saturday night, trapping thousands of people in subways and elevators for a time, leaving drivers to fend for themselves at intersections with no traffic signals and eerily dimming the lights of a swath of Times Square.
Stores emptied out, and Broadway shows did not go on: Most theaters canceled their performances. In restaurants and bars, people drank by the light of their smartphones.
Mayor Bill de Blasio, asked whether anything nefarious happened, said Con Edison believed that the blackout was caused by a mechanical issue that could be resolved in a relatively short period of time.
Con Edison said that the power failed around 7 p.m. and that about 62,000 customers were in the dark, mainly on the West Side. The Fire Department said the failures stretched from 72nd Street to the West 40s, and from Fifth Avenue to the Hudson River.
Con Edison said it did not know how soon electricity would be restored.
The blackout happened on the same date that a massive power failure in 1977 plunged the city into darkness. (Now as then, Times Square — usually blindingly bright with crowds strolling to theaters — was dark, and traffic signals were out.)
At intersections on Saturday, police officers and civilians worked together to direct traffic while fire trucks and ambulances screamed down side streets. Two young women posed for a selfie in the middle of 46th Street before an officer rushed over and chastised them, saying, “Ladies, this is not the time.”
A spokesman for Con Edison said the failures apparently stemmed from a problem at a substation on West 49th Street. The New York City Council speaker, Corey Johnson, said on Twitter that there had been a “major disturbance” at that substation and that the utility was working to fix it.
The Metropolitan Transportation Authority, which runs the subways, said that “our entire system is affected” and that there was only limited service on the Nos. 1, 2 and 3 lines on the West Side; the Nos. 4, 5 and 6 lines on the East Side; and the No. 7 line between Manhattan and Queens.
There was also “smoke in multiple buildings” on the West Side, the Fire Department said, and it was answering “numerous” reports of people stuck in elevators.
With signals not working, a group of men in shorts and T-shirts were directing traffic at the intersection of 10th Avenue and 47th Street. With no police officers in sight, one called out: “If you’re going to walk, walk now, people!”
Another yelled as pedestrians began to cross hesitantly: “Health and safety! Health and safety!”
Ellie Shanahan, 23, was on the A train between 50th and 59th Streets when the train stopped unexpectedly. She waited with the other passengers for nearly 20 minutes before an M.T.A. worker announced that there was a power outage and that there would be no train service between 59th and 163rd Streets.
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Ms. Shanahan was on her way to visit her parents in Washington Heights. After evacuating the subway station, she said, she noticed police officers trying to monitor the frantic crowd at 50th Street.
She immediately got on a Citi Bike and rode it north to 125th Street.
“What was craziest to me was there was no traffic lights,” Ms. Shanahan said. “I was in shock, but people still seemed to know what to do. Everyone was being polite even though there were no lights to tell us when to go.”
As she biked north on Broadway, Ms. Shanahan noticed restaurants emptying out and long bus lines. She saw people evacuating a pitch-black movie theater on 66th Street.