Passengers walked through the train to the platform, Stessel said. There was no evacuation to the tunnel itself, he said.

Riders said over social media they were stuck on board for more than an hour. From their reports, the affected train appeared to belong to Metro’s 7000-series, the newest model of railcar in Metro’s fleet.

The agency did not immediately confirm the series of the train or describe the nature of the issue.

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Renee Warren, a passenger, said crews ran back and forth trying to power the train but it wouldn’t budge.

Some older passengers were panicked, she said.

“It was extremely hot,” she said. “We had no air or anything.”

Warren said passengers exited the train by walking through the railcars onto another train, from which they walked to the platform.

Stessel said the disabled train was taken to a rail yard, where the problem will be diagnosed.

During the hour-long ordeal, trains on the Orange and Silver lines single-tracked between the Clarendon and Foggy Bottom stations and Blue Line trains single-tracked between the Foggy Bottom and Arlington Cemetery stations.