Simple animation of a train collision. Two tank cars collide and one leaks gas. The gas ignites and causes the leaking car to spout flames. The flames from the first car heat the second. The pressure relief valve on the second car lets off pressure. The car appears in cross section and the liquid inside slowly boils away. The tank fails from the heat and pressure. It bursts open, the gas ignites and the car explodes. Part of the car rockets away as the explosion destroys a small town.