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Many of the "old heads" I worked with in the early 60’s talked about the unusually high numbers of RED signal violations as a result of handling the large numbers of WW II "unit" oil trains. As Pete mentioned in his post, these trains were subject to undesired movement after "STOPPING" at a red signal. It must be remembered that a "LOADED" tank car does NOT always mean a "FULL" tank car !! The unfilled space within the tank allows the commodity to obey the laws of physics pertaining to liquids. The movement of the tank and the movement of its contents march to different drummers.
At the Armour-Dial plant in Montgomery, IL,. it was often necessary to weigh "loaded" cars of tallow and glycerin. This became an exercise in futility. When a car was moved onto the scale and a stop signal was given the Engr. would attempt to stop the movement as requested. There were, often, 8 to 10 cars to be weighed. Moments after the engine stopped the entire cut of cars, along with the engine, would be VIOLENTLY moved in the opposite direction of travel. Moments after THAT event the entire cut was, just as violently, moved again, in its original direction of travel. That secondary "slosh" was every bit as violent as was the first event. It would often move the equipment 30 feet or more. Remember, this happened while handling only 8 or 10 cars. With 40 or 50 cars of oil I’d stop WAY back of a RED signal
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