The incident took place in September at the Gateway SkyTrain Station in Surrey, B.C., but the victim, a 29-year-old Japanese exchange student, was too traumatized to report it at the time.
She came forward later after describing the incident to her homestay host, who encouraged her to report it.
Transit Police says the woman, who spoke very little English, was trying to buy a fare the morning of Sept. 6, when a man approached her and offered to help.
He then forced himself on her, and repeatedly kissed and hugged her.
"She was finally able to push him away and head to the train platform where she boarded a train. The suspect left the station on foot, shortly afterwards," said a written statement from the Transit Police.
She was finally able to push him away and head to the train
The suspect, a balding white man in his late 50s, is approximately 6 feet tall and weighs 170 lbs.
He was clean-shaven and was wearing beige pants, a light, possibly green, shirt, a brown jacket and brown shoes, and was carrying a brief case the morning of the assault.
Transit Police is asking anyone with information to call the force at 604-515-8300, or to call CrimeStoppers to submit an anonymous tip.