It happened at about 11:30 p.m. Nov. 8 as the victim was leaving the station in White Plains.
Police say she was walking along the sidewalk from the train station and turned to go down a path off Water Street when a man rode by on a bicycle and grabbed her.
The victim, who is in her 20's, was able to put up a fight, fending off her attacker. He jumped on his bike and rode off, but not before she got a good look at his face.
Police have released a sketch of the man they are looking for. He is about 5'6" and in his 20's.
It is a busy area, with more than 10,000 commuters coming through the White Plains train station daily.
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