The unidentified woman suffered a head injury after she was hit around 6:38 p.m., Metro-North said.
She was taken to Nyack Hospital with non-life-threatening injuries, where she was treated and released, Metro-North said.
The NJ Transit train, which was traveling from Spring Valley to Hoboken, was carrying about 35 passengers.
Neither NJ Transit nor Metro-North was able to say who the woman was or where she was from.
Orangetown police, who investigated the incident, referred press inquiries to Metro-North.
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