BUENOS AIRES, Argentina-- Officials say a packed train has slammed into the end of the line in Buenos Aires' busy Once station, killing 49 people and injuring hundreds of morning commuters. It is Argentina's worst train accident in decades.

Federal Police Commissioner Nestor Rodriguez says Wednesday's dead include 48 adults and one child.

It's Argentina's highest death toll from a train accident since 1970, when 200 were killed in a train collision.

"There are people still trapped, people alive, and there may have been fatalities. We don't know if there are dead people" in the wreckage, J.P. Schiavi told reporters at the station.

The commuter train came in too fast and hit the barrier at the end of the platform at about 12 mph, smashing the front of the engine and crunching the leading cars behind it, Schiavi said. One car penetrated nearly 20 feet into the next, he said.

Most damaged was the first car, where passengers make space for bicycles. Survivors told the TeleNoticias channel that many people were injured in a jumble of metal and glass.

Passengers said windows exploded as the tops of train cars separated from their floors. The trains are usually packed with people standing between the seats, and many were thrown into each other and to the floor by the force of the hard stop.

Many people suffered bruises, and many with lesser injuries were waiting for attention on the Once station's platforms as helicopters and more than a dozen ambulances took the most seriously injured to nearby hospitals.