Police have launched an investigation after a woman on board a train suffered racist abuse from a group of men on January 31.
Investigators are appealing for witnesses of the incident, which took place on the 5.51pm Clapham Junction to Shepperton train, to come forward.
"A group of five or six men, who were also accompanied by two large dogs, began using derogatory and foul language towards a woman who was travelling on the train," said investigating officer Detective Sergeant Tony Burman.
"The men, who are described as being between 40 and 50 years old, left the train at Fulwell station and made their way out of the station."
"The victim has been left very upset by what took place and I am now appealing for anyone with information to come forward with information that may help with our investigation."
He continued: "BTP (British Transport Police) do not tolerate this kind of behaviour on the rail network and take reports of racial abuse extremely seriously. I'd urge anyone who has any information about the incidents, to contact us as soon as possible."
Anyone who information is asked to contact BTP on 0800 40 50 40 quoting log 526 of 31/01/2013. Information can also given to the independent charity Crimestoppers, anonymously, on 0800 555 111.