Eliminate all ignition sources. (Remove everything that could catch on fire)(Make sure you are wear hazmat suits and googles) Stop or control the leak, if this can be done without undue risk. Use water spray to cool and disperse vapors, and protect personnel. Control runoff and isolate discharged material for proper disposal. (shovel up the contaminated dirt and get ride of anything that has been touched by the chemical) Fire situations may require evacuation. (As long as your body is completely covered by a hazmat suit, you will not be harmed unless it lights on fire, so you are safe to touch the chemical and properly remove the contaminated material.)
Then properly dispose of the train car because it is no longer toxic.
What it's Used for: