So the Rail cars carrying Anhydrous Ammonia around our great nation must never EVER have an incident where there are releases, or catastrophic failures? WOW those must be the best cars ever built - NOT. An unlikely scenario, maybe you have been around the NH3 too much already, I know it has Chronic Health Effects to the respiratory as well as Acute Health Effect, but I did not know it effects the nervous system specifically brain tissue.
ANY transport container on ANY highway or roadway has the "POTENTIAL" for a catastrophic failure. While the possibility of the tank just failing while sitting there undisturbed is truly unlikely, what about the "POTENTIAL" for an accident? Someone runs a red light one day, t-bones your vehicle severing the supply lines spewing forth a toxic cloud. Even if the accident may have not killed you, at that proximity the gas will. There is always the possibility that an incident could occur, why do you think Emergency Response Agencies train for 40 hours for initial HAZMAT certification, then attend additional courses that specialize in products such as NH3.
So, does this vehicle have dead man fill valves, double redundancy safety valves, pressure relief valves, and excess flow valves? And does the DOT certificate certify the tank for the storage AND transportation of NH3 and is the Hydrostatic Test date current as well?
Enough said, I'll just wait for the news reports . . .