A video of two men fighting on an SMRT train last week has gone viral online.

The video clip, which shows two middle-aged Chinese men shouting at each other in Hokkien and exchanging punches and kicks in the linkway between two train carriages, has been shared around 1,690 times on Facebook by Friday evening.

Mid-way through the video, an announcement indicating that the train's emergency button has been activated could be heard. At the same time, the two men could be seen wrestling each other to the ground, while several commuters screamed in the background.

The fight continued until a fellow passenger in a black polo t-shirt intervened to separate the pair.

Responding to queries from The Straits Times, SMRT's director of Media and Marketing Communications Alina Boey said that the incident happened at about 11.55pm last Saturday, on a southbound train that was approaching Yio Chu Kang MRT station.

"A passenger on board activated the Emergency Communication Button, which in turn triggered our station staff at Yio Chu Kang station," said Ms Boey. "SMRT staff were on hand to escort the two parties out of the station."