Heart-stopping footage has emerged of daredevils clinging to the back of high-speed trains.

The so-called ‘train surfing’ was spotted in Sydney, Australia.

Footage uploaded to YouTube shows teenagers dicing with death as they cling onto carriages with live tracks just a couple of feet below.

Another video was shot by a teen’s headcam.

People have died whilst performing such stunts and authorities warn there will be penalties for anyone caught.