Police are searching for a suspect they say assaulted the woman inside the W. 148th Street and Lenox Avenue Subway Station.
It happened just after 1 p.m. on Friday.
The on-duty worker told police she was standing on the platform when a man approached her and punched her.
The suspect was able to flee the station on foot.
The victim was taken to NYC Health and Hospitals/ Harlem. She is expected to recover.
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