Shocking viral video shows train conductor asleep seconds before potential crash in San Francisco - WATCH

A San Francisco train conductor was found asleep at the controls, narrowly averting disaster as the train hurtled at 50 mph. Passengers were thrown as the train took a sharp, accelerating turn. The driver, jolted awake, managed to stop the train and calm panicked riders. An investigation revealed operator fatigue, not mechanical failure, as the cause.