They found the good Samaritans, one of whom happened to be a cardiologist, performing CPR on an unconscious man on an a train.
The officers, who had a defibrillator, managed to shock the 50-year-old man's heart back into action.
Once they had a pulse, the man was rushed to the hospital.
He was listed in stable condition and, officials say, he is expected to make a full recovery
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