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Throwing a red signal in front of a train is an absolute no-no. An engineer who sees a signal suddenly go to red must assume the worst, and stop short. If that requires an emergency brake application, the chance of a derailment or break-in-two is very large. As a train dispatcher, we were prohibited by rule from taking away a signal from a train without first verifying with the train's engineer that he could still stop safely. <br /> <br />
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