was pulling 212 cars! I haven't heard any official cause for that derailment but that is a VERY long train. I saw on the video that some of the cars were auto haulers, those things are 90 to 100 feet long themselves. I don't recall seeing any trains with more than 150 cars in my 30+ years working on the track and most were not over 100 cars and had more crew members on the train back then. The longer the train the harder it is to control. When their rolling down the track the train is stretched out, when they start braking if not done properly they have slack action as the cars run together and that can cause all kinds of problems, especially with heavy loads behind empty cars.