One has to wonder why they used a train to test its strength? I would have expected them to test it in more realistic means, like dropping it from a great height, like from a plane or trying to blow it up, with C4, TNT etc or try to destroy it by military force? Why a train?
I don't know much about nuclear power, technology or how its used, transported as Australia hasn't been blessed with nuclear capabilities so its all a bit foreign to me.
Do any aspects of nuclear technology travel by train, like bombs or nuclear 'bits' or any hazardous materials? If that were the case, then it explains why the tested it with a train.