WATCH: Video shows someone riding atop a speeding GO Train

 

It's not clear when it was taken or who was responsible, but Metrolinx is investigating after video of a dangerous stunt began making the rounds online.

It shows someone riding on the very top of a double-decker GO Train as it speeds down the tracks.

You never see the person's face but the camera pans to show the surrounding area and the person's feet are seen dangling off the edge. They later appear to be standing on the train.

Metrolinx spokesperson Anne Marie Aikins tells CTV Toronto, she gasped when she saw the video.

She says these trains are about 24 feet tall and can travel 80 km/h.