The locomotive on the Norfolk Southern train that had a mass derailment in East Palestine was “put immediately back into service” and all but 20 minutes of video from it right before and after the incident is gone, the National Transportation Safety Board chairwoman testified at a Senate committee hearing.

NTSB Chairwoman Jennifer Homendy said Norfolk Southern video on the derailed train, which had an inward facing camera, “was overwritten. That means the data only provided about 15 minutes of data before the derailment and five minutes after the derailment.”

She testified during Wednesday’s hearing by the U.S. Senate Committee on Commerce, Science and Transportation.

The NTSB is investigating the East Palestine derailment that occurred Feb. 3 after a wheel bearing overheated.

Homendy called for changing the video policy to be in line with requirements for Amtrak and commuter railroads, which are required to maintain 12 hours of nonstop video, because it is vital to investigations.

U.S. Sen. Ted Cruz, R-Texas and ranking Republican on the committee, said he was shocked when he heard what Homendy said.

“Any time there is a locomotive involved in a serious derailment, it is lunacy that video is not preserved and that locomotive is put into alternative service,” he said. “I’m confident we can get unanimity from this committee on that.”

Asked about the minimal video from the derailment, Norfolk Southern CEO Alan Shaw said his company “followed protocols.”

Homendy also asked that the definition of high-hazard flammable trains be expanded to include “a broader array” of hazardous materials. The Norfolk Southern train that derailed Feb. 3 in East Palestine releasing toxic materials into the environment does not fall under that category.

Two days after the East Palestine derailment, Norfolk Southern decided to control explode five cars containing vinyl chloride, a toxic chemical, concerned that it would probably explode and pose a life-threatening danger, sending shrapnel into the air and traveling for almost a mile.

Homendy asked Congress to consider requiring rail companies to provide information on the chemicals on trains going through communities and eliminate the current threshold of tank cars carrying hazardous materials to 20 in a row or 35 dispersed throughout a train.

Wednesday’s committee hearing, titled “Improving Rail Safety in Response to the East Palestine Derailment,” lasted three and a half hours.