A family was racially abused and had takeaway food thrown at them on a late night Liverpool Street train to Essex.
The man, woman and three children were targeted on the 12.18am service to Colchester via Chelmsford when they were returning home to Shenfield from a day spent in London on December 7.
British Transport Police have now released CCTV images of two men they want to speak to in connection with the attack.
Detective Constable Sally Everritt said: "A husband and wife and their three children boarded the train at Liverpool Street after spending Saturday in the capital.
"As the train left London the family were abused and intimidated by a group of young men. Some of the abuse was racist in nature and take-away food was also thrust at the family.
"The family got off the train at their hometown of Shenfield but the group of men continued on the service towards Chelmsford and Colchester.
"It was one of the last trains back from London to Essex that night, and it was very busy. Many other passengers would have witnessed what happened, and I am keen to speak to anyone who has not yet come forward to police."
Anyone with information is asked to contact British Transport Police on 0800 40 50 40, or text 61016, quoting reference B9/ESUB of 05/01/2015 or contact Crimestoppers, on 0800 555 111.
