The act "twerking," which is gyrating one's hips to mimic sexual intercourse, has become popular since Miley Cyrus twerked with Robin Thicke on MTV's VMAs during the summer.
In a video (below) that was uploaded to YouTube earlier this week, the girls do not show their faces, but gyrate as laughing cameraman films them and giggles, "Twerking on the train!"
The train station is not identified, but is believed to be the 8th Avenue station in New York City.
The girl twerk dangerously close to the electrified third rail.
“One word, dumb,” MTA spokesman Kevin Ortiz told the New York Post.
Police are investigating the incident, reports Metro.co.uk.
The video has gone viral with over 75,000 views.