The woman was walking away from Datchet railway station in Berkshire at about 22:10 BST on Wednesday when she was approached by her attacker.
After trying to ignore his advances, the victim was dragged to a wooded area at the junction of Majors Farm Road, Ditton Road and London Road.
Thames Valley Police said the woman was being supported by specialist officers.
The attacker was described as an Asian man of average build aged about 35 to 45 with receding black hair and a prominent nose.
He was holding an umbrella and wearing a smart jacket or blazer, a dark patterned scarf and blue jeans.
An 18-year-old woman was raped on the side of the road shortly after leaving a village railway station.