The Nationwide Transportation Security Board on Tuesday mentioned it opened a particular investigation into Norfolk Southern after latest derailments.

The particular probe will look into the corporate’s group and security tradition, in accordance with a press launch.

“Given the quantity and significance of latest Norfolk Southern accidents, the NTSB additionally urges the corporate to take quick motion right now to assessment and assess its security practices, with the enter of workers and others, and implement obligatory adjustments to enhance security,” the NTSB mentioned in a press release.

Norfolk Southern did not instantly reply to a request for touch upon the NTSB probe.

The information comes earlier than Norfolk Southern CEO Alan Shaw is about to testify Thursday earlier than the U.S. Senate Committee on Atmosphere and Public Works to deal with potential threats to public well being and the setting ensuing from the East Palestine, Ohio, derailment final month.

Committee Chairman Sen. Tom Carper, D-Del., mentioned the panel needs to learn about a wide range of points stemming from that derailment.

“What did they do properly? What did they do badly? What are they doing to deal with issues that they botched? What are they doing for the reason that incident occurred as a way to make folks really feel cared for, cared about?” Carper instructed CNBC. “Once we stroll out of there, I wish to make it possible for Norfolk Southern is doing what they should do to make this proper. Not simply with respect to the oldsters in the neighborhood but additionally by way of the motion of those hazardous substances throughout our nation, whilst we communicate.”

The NTSB launched a preliminary report final month that pointed to an overheated wheel bearing as an element within the derailment and fireplace.

On Saturday, one other Norfolk Southern practice derailed close to Springfield, Ohio. Not like the East Palestine incident, this practice wasn’t carrying hazardous supplies. No accidents had been reported following the derailment.

The NTSB has launched investigations into 5 accidents involving Norfolk Southern, together with the demise of a Norfolk Southern conductor Tuesday morning in Cleveland after a dump truck collided with a practice at a metal facility. The conductor, who was recognized as Louis Shuster, was struck when a dump truck carrying limestone collided with the aspect of the practice’s first automobile, a Cleveland Police spokesperson mentioned.

–CNBC’s Christina Wilkie contributed to this report from Washington.