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The UP is negligent, if the yard was at the top of an over 30 mile downhill grade, there should have been a derail protecting the mainline from runaways. <br /> <br />The crew was wrong for not putting on handbrakes. But that isn't the only possible way a runaway can occur. I have seen the wedge that holds the drawbar in the car fall out allowing the coupler to fall on the ground. If this happened during a shove with no air there would be no way to even try to catch the cars. <br /> <br />Allowances for emergency circumstances must be built into a yard and the UP didn't do that.
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