More than 40 people have been killed and some 550 injured after a train packed with commuters slammed into the end of the line in Buenos Aires.
The train is reported to have come into the city's Once station and hit a barrier, sending the second carriage crashing into the first.
Numerous witnesses have suggested the brakes appeared to fail.
Others described windows exploding as the tops of the train's carriages separated from their floors.
A woman named Myriam said: "In a blink of an eye we were on the floor. I don't know how we got out. The door crashed in on me."
Another unidentified passenger told reporters: "People started to break windows and get out however they could.
"Then I saw the engine destroyed and the train driver trapped amongst the steel."
At least 49 people are confirmed dead, according to officials.
The accident happened during the busy morning rush hour on the packed Sarmiento line, which is used by commuters heading into the city from the suburbs.
The train's driver was among the hundreds injured in the accident. Reports said he had to be cut out of the wreckage of his cabin.
Argentina's transport secretary Juan Pablo Schiavi said the train failed to stop after coming into the station, crashing into a retaining wall at the end of the track.
"It was a very serious accident," he told reporters. "(Carriages) piled up on top of each other, and one of them went six metres inside another (carriage)."
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