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Locomotive lashup restrictions imposed after unknown incident
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CPR is prohibits running more than 8 units in a consist, regardless of whether they are on-line, isolated, or dead. Apparently this is because the AEI readers on the CPR system are calibrated to recognized no more than 8 locomotives to a train and exceeding that limit causes the system to crash. As to why the limit was set at eight, I have heard varyious reasons of which the most likely seems to be that the combined weight of locomotive consists exceeding eight units was believed to a contributing factor in multiple incidents including several rolled rails and and least one serious derailment. <br />There are limits for a consist's number of driving axles and dynamic braking force as well, but with today's high horsepower units they are usually reached long before the 8-unit maximum.
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