About 80,000 rail cars don’t meet safety standards and need to be updated or replaced, according to the head of railcar maker The Greenbriar Companies.

Following several oil train crashes, CEO William Furman says “modest but meaningful” fixes could immediately reduce the risk of a hazardous materials leak by up to 80 percent in derailments, Reuters reports.

Rep. Peter DeFazio (D-OR) has called for the House Transportation and Infrastructure Committee to hold a hearing on freight rail safety, especially DOT-111 tank cars, in response to last week’s BNSF oil train derailment and fire in North Dakota. The train was using DOT-111 cars.