India, Sept. 24 -- The Delhi Metro Rail Corporation (DMRC) has begun broadcasting in-train announcements warning commuters against shooting reels, dance clips or other social media content within metro premises, and that doing so will attract a fine.

The move, which started on September 14, will cover the entire network by the end of this week, officials said.

The bilingual announcements -- made in both Hindi and English -- join DMRC's existing reminders asking passengers not to sit on floors or eat inside coaches. The new message is blunt: "Filming reels, dance videos or any other such activities are strictly prohibited."

To be sure, though the Metro Railways Act, 2002, does not specifically mention reels, DMRC officials said violator...