It happened just after 10 a.m. at Broadway and West 225th Street in Marble Hill, with the manhole cover blasting into the elevated subway line above.
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There was concern that the explosion may have compromised the tracks of the 1 train, but a survey found no structural damage outside of a dent in a beam that did not impact service.
The injuries were described as minor, and one person was transported to a local hospital.
Related: Manhole explosions, fires awake residents on Upper West Side
An electrical fire is believed to be the cause of the explosion.
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The FDNY and Con Edison responded, and crews remain on scene.
There were no reported power outages in the area.
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