Bengaluru, July 14 -- A video purportedly showing a young couple engaging in an intimate display of affection inside a Namma Metro train has gone viral on social media, triggering widespread debate over acceptable behaviour in public spaces.

The incident is said to have occurred on the Purple Line on a train heading towards Whitefield. According to social media posts, the couple was seen embracing and kissing inside a coach as the train approached KR Puram Metro station, reportedly in full view of fellow passengers.

Several commuters expressed discomfort over the incident, pointing out that Namma Metro is used daily by families, senior citizens, women and schoolchildren. A fellow passenger allegedly recorded the video on a mobile phone,...