The NTSB's final report on the 2024 North Dakota derailment blames aging DOT-111 tank cars for the severity of the fire and chemical spill. - The derailment was caused by a collapsed culvert, but leak-prone tank cars made the crash worse.
- Methanol and anhydrous ammonia spilled and caught fire, forcing two homes to be evacuated. - The NTSB has been urging replacement of DOT-111 cars for hazardous materials since the 1990s.
- Congress mandated replacement for flammable liquids by 2029, but other hazardous uses may continue.