Board Thread:Speculation House/@comment-16277621-20130823040543/@comment-16502426-20131104161831

Actually, I'm starting to think that monetarily, dust is not as expensive as you might think. The cops seemed genuinely surprised that someone would bother to steal that much dust and nothing else.

So maybe something else was up with the train other than just dust, something shadier? Hence it being a target to blow up and having immense security. This could also explain why this 'car of dust' being stolen made Weiss' father particularly mad. She likely wouldn't have known about whatever it was that was the true reason, only that he was mad beyond all belief.