The amount and type of toxic elements going down the rails and our highways would make us all run for cover if we knew about even a small portion of it.
VX Nerve Agent (O-ethyl S-(2-diisopropylaminoethyl) methylphosphonothioate) can be neutralized with ordinary water (approximately 10% volume) and burned in a commercial incinerator without releasing HEAVY METALS to the environment, and once neutralized, there really is NO LONGER any chemical agent.
By the way it is not "nerve gas", it is a liquid.