Watch below as a stumbling man falls on the train tracks at Sydney's Berala station. Fortunately, a passer-by acted quickly. Very quickly. From 9News:
Sydney Trains boss Howard Collins, a former driver, told 9NEWS that incidents like those "stop the hearts" of train operators who are unable to avoid a collision.
"You might say a few expletives under your breath, you're waiting for that impact," he said.
The driver in the incident did activate the vehicle's emergency brakes when the man came into vision however, at full speed, a train takes about a kilometre to come to a complete stop.