Just ran across this news link from JEMS which I thought some of you may like. Since the article is based on a public safety standpoint, not much is said in terms from a railroading view, but still a good coffee read.
http://www.jems.com/article/news/tank-car-derailment-causes-mic
Kenny T
http://www.jems.com/article/news/tank-car-derailment-causes-mic
Kenny T