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Village evacuated after Quebec train derailment

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[quote user="BroadwayLion"] [quote user="Falcon48"]but I believe that modern locos have a pressure maintaining feature, which would result in maintaining a reduced pressure in the train line even though the brakes are set ([/quote] These were not "modern" locomotives. They may not have been so equipped. <div style="clear:both;"></div> [/quote] According to explanations here by our air brake experts, the pressure maintaining feature would not have played a role in this incident if the brakes were properly set.  If they were properly set, the train line would be 100% exhausted and open to atmosphere.  The brake cylinders would have been fully presurized and holding the brakes fully applied.  Therefore, it would be impossible for the brakes to release due to a slow and unintended pressurization of the train line.  Being open to atmosphere, the train line could not possibly be pressurized. So the only way the brakes could release on their own, would be for the pressuized cylinders to leak off, or for someone to walk the train and pull all the bleed rods.  If the cylinders were to simply leak off, it would not have happend in just a matter of an hour or so.  Most likely, it would have taken several days minimum.
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