The victim was attacked at the back of Winson Green Outer Circle Metro station in Birmingham at around 7.15pm on April 14. Police have stepped up patrols in the area while specialist officers are supporting the victim.
British Transport Police (BTP) has released CCTV images of a man they want to speak to who is believed to have “information vital to their investigation.”
Detective Inspector Granville Sellers said: “This is a very serious incident and I would like to reassure the public that since it was reported we’ve had officers carrying out vital investigative work and providing the victim with support.
“We ask anyone who knows the man in the image to contact us immediately.”
CCTV pictures show a man with dark hair and facial hair, wearing a dark padded gilet with a light hood.
He is wearing dark trousers and light Adidas trainers.
Dedicated and specialist officers are following many lines of enquiry.
Anyone with information is asked to contact BTP by texting 61016 or by calling 0800 40 50 40 quoting reference number 10 of 15/04/20.
Alternatively, people can call Crimestoppers anonymously on 0800 555 111.