At around 10.55pm on Wednesday April 3 the victim was leaving St Mary Cray station when he was approached by two young men. The men demanded he hand over his phone and threatened to stab him.
British Transport Police Officers investigating the alleged robbery are today releasing CCTV images in connection with the incident.
If you recognise either of the men, or have any other information, please contact BTP by texting 61016 or call 0800 40 50 40 quoting reference 239 of 5 April
Alternatively, you can contact Crimestoppers anonymously on 0800 555 111.
Officers believe the men in the images may have information which could assist their investigation.