The first question is, what was causing the pressure to build? Physically, there is no difference between a tank sitting on its wheels on a track and a tank lying on its side on the ground. There is nothing about a tank lying on the ground that would cause pressure to build. Was there a fire around the rail cars? I've seen nothing indicating that this was the case, nor is it likely there was a wild land fire in the middle of winter in Ohio. How did they know pressure was building? Were they monitoring a pressure gauge on...