Footage has been released of Tuesday's major transport accident in Argentina.

Cameras on the train platform in Buenos Aires captured the moment when a train plunged into a bus and then strayed across the tracks into a second train.

In the footage crowds of people are seen pouring out of the second train's doors and windows.

A different camera from the next platform captured the impact from a new angle. It showed a person jumping out of the second train and running across the tracks to the platform just before a large electric explosion fires on the damaged track line.

The rush-hour crash left 11 people dead and more than 212 people injured.

Officials said as many as 30 of the injured were very badly hurt, suggesting the death toll could climb substantially.

Argentina's transportation secretary Juan Pablo Schiavi said most of the fatalities were among people who had been aboard the bus, including the driver.

The crash occurred at 7am local time on Tuesday as thousands of commuters were pouring into the Flores district station in southwestern Buenos Aires on their way to work.

"A train entering Flores station hits a bus from the 92 Line, drags it and smashes it against the platform," said Gustavo Gago, a spokesman for the Buenos Aires train operator.

"At that point, the train goes off the track, invading other tracks in its path and is struck laterally by a train that was entering Flores," from another direction, he said.

Authorities were investigating reports that the bus driver failed to heed a train crossing signal and breached the lowered barriers meant to signal that it is dangerous to cross the tracks.