On July 16 at around 4:55pm the victim, a woman, got off a train at East Croydon station with her husband and daughter.
A man who left the same train reportedly jogged up beside the victim, before pushing her into the Perspex shelter window.
Police say he left the station on a train heading to Hastings in Kent.
The victim was left with injuries including a fractured cheek bone, a cut to her chin and facial bruising.
British Transport Police say the man in the CCTV images may have information to help with their investigation.
A spokesperson for British Transport Police said: “Detectives investigating an assault that left a woman with a fractured cheek are today releasing these CCTV images in connection.
“At around 4.55pm on Sunday, 16 July, the victim left a train at East Croydon station with her husband and daughter.
“A man left the same train and jogged along platform 4 to catch up the victim. Once walking side by side with her, he pushed the victim over into a Perspex shelter window.
“He then left the station on a train Hastings via Kent.
“The victim was left with a fractured cheek bone, a deep cut to her chin, and bruising to the face.
“Officers believe the man in the CCTV images may have information that could help with their investigation.
“Anyone who recognises him is asked to contact BTP by texting 61016, or by calling 0800 40 50 40 quoting reference 495 of 16/07/23.
“Information can also be given anonymously to Crimestoppers on 0800 555 111.”
