Paramedics battled to save her life but she was pronounced dead at the scene.
Officers say that despite “extensive enquiries” since the incident more than a month ago, they have been unable to identify any relatives to “inform them of this sad news”.
British Transport Police is now asking the public to urgently contact them if they have any information which may help track Ms Ribeiro’s next-of-kin.
She was born on November 19, 1976, and was from Portugal. She is also believed to have had relatives in South Africa, although they have not been identified.
Anyone who may have information which may help is being asked to “urgently” contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 537 of 17/12/21.