A double-decker commuter train collided with a train that had stopped between two stations outside Buenos Aires today, killing at least three people and injuring 150 more, CNN reports. Emergency crews are currently pulling people from the wreckage, with helicopters air-lifting some to area hospitals. A union leader is saying that the double-decker had just been brought back into service after six months offline, the AP reports. Among the items fixed during that time: the brakes. (More Argentina stories.)