Fiery North Dakota derailment was latest crash to involve weak tank cars the NTSB wants replaced

The fiery North Dakota derailment that burned for days early last month was the latest train crash to involve the flawed tank cars that the National Transportation Safety Board has been trying to get off the tracks for decades.

The NTSB said in a preliminary report released Thursday that the July 5 train crash near the small town of Bondulac, North Dakota, caused an estimated $3.6 million damage to the CPKC railroad tracks and equipment. But the agency didn’t offer many hints about what...