The surprise choreographed dance, which featured around 200 people singing and dancing in the Chhatrapati Shivaji Terminus station, took a month of planning and practice to pull together, according to an article in The New York Times.
"One of the top items on my travel to-do list, which I never got around to in Europe, was to be a part of a flash mob," Shonan Kothari, one of the organizers, told the Times. "Since India didn't have anything of the sort, I figured I'd do it myself."
While it may have been city's largest, the flash mob was not the first. According to The Indian Express, Mumbai's first flash mob occurred in 2003 when some 60 people surprised shoppers at the CrossRoads Mall in downtown Mumbai.
In a blog post, The Washington Post noted that the flash mob took place almost three years to the day after a deadly mass shooting at the same station that left 166 people dead.