The Argentine government announced on Tuesday the "temporary and preventive" takeover of commuter rail operator Trenes de Buenos Aires (TBA) amid harsh criticism by relatives of the victims of the rail accident that left 50 commuters dead last week.
Officials will take "administrative, technical and operational" control of TBA to "guarantee the safety" of riders, according to the government decree.
The crash killed 51 people and injured many more.
The intervention would last for 15 days, or as long as it takes authorities to complete the judicial investigation to clarify responsibility for one of Argentina's worst-ever rail accidents.
An eight-car train entered the Once station, one of the busiest in the capital, at 8.30am local time last Wednesday at a speed of 26km/h and slammed into the barrier at the end of the platform.