The astonishing moment a man suddenly collapses and flips off a station platform and onto the tracks - before hero commuters rush to save him from an oncoming train

Incredible footage shows the moment a man faints and falls forward onto train tracks before six other passengers jump onto the live railway to rescue him.

At 1.54pm on a busy Monday afternoon at Sydney's Wynyard station the man can be seen on security footage stumbling in the direction of the tracks, 7 News reports.

Without warning he appears to faint and tumbles head-first in front of an oncoming train, laying unconscious across the railway.
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At 1.54pm on a busy Monday afternoon at Sydney's Wynyard station the man can be seen on security footage stumbling in the direction of the tracks, 7 News reports

A customer service officer wearing a high-visibility vests springs into action, immediately using the emergency stop signal of two raised hands to prevent the train from running him down.

Onlooking passengers chose to jump onto the tracks and help the man to his feet - an idea Sydney trains heavily discourages no matter if the train appears to be halting or not.

'We understand it's human nature to want to help someone who has been injured but jumping onto a live track is extremely dangerous,' Rob Austin from Sydney trains said.