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Another factor in car sway is side bearing clearance. Each truck has two side bearing points (just large steel blocks) that allow the car to sway independant of the truck. This is supposed to keep the car and the truck from swaying together, which will cause the car to tip over. I believe the side bearing clearance should be kept at about 1/4" or 3/8", but have seen may with no clearance and many with clearances over 1/2". <br /> <br />Another reason covered hoppers are a problem is the grain that they carry acts like water when going around curves, shifting back and forth. If a train gets going to fast around a sharp curve all the grain runs to one side of the car and can tip it over. This is what happened a couple months ago on La Veta Pass. Now run by Rail America, the crew lost control of the train going down the 3% grade on the east side of the past and the shifted grain tipped 17 cars off of the rail and down the side of the mountain while the locomotives stayed on the rail without any problems
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