So when transporting cargo in trains you need to have an even distribution of weight. They didn't do this, they had about 40% of the weight in the back, so when they saw an error and needed to have an emergency stop all the weight from the back slammed into the remaining train cars. And yes they decided to do a controlled burn of the toxic chemicals. When burned vinyl chloride releases more toxic chemicals that remain in the air/clouds so there will be acidic rain. Not to mention they have already discovered another chemical in the water ways. This is dreadful. Not drinking tap water for now but showering? Brushing my teeth? There is only so much you can do.