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Village evacuated after Quebec train derailment

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[quote user="BigJim"] [quote]As long as that handle was in the brake application position, having the locomotive running or not makes not a bit of difference to the brakes, they will stay applied until someone moves the handle to the equalize (release)setting, or closes the anglecock on the lead car, which might allow enough air to leak from the cars reservoirs to begin equalizing the pressure and slowly releasing the brakes, but in the time frame mentioned, that would have to be a major leak and on more than one car.[/quote] Finally, somebody that understands how train brakes work! Pay attention folks! Thanks Ed As Ed has said, if there was still continuity in the trainline and the brakepipe pressure hadn't been drawn down a good bit below "Full Service" to begin with, anything that would have caused a rise in the brakepipe pressure of just a pound and a half over whatever the brakepipe reading was at the time could have triggered a brake release on every car in the train. <div style="clear:both;"></div> [/quote] Just to be clear, I was not disagreeing with you earlier when I posted something that was contrary to what you had explained.  I was only posting what the president of the railroad had said.  He said that shutdown of the engine released the brakes.  But personally, I am fine with your explanation. Although I do have one question:  With the train standing like it was (with the locomotive coupled to the train), what would be the proper condition of the trainline?  Would it be completely exhausted and open to atmosphere?  If so, I don't understand the concern over reservoir leakage raising the trainline pressure and causing a release.  How could leakage raise the trainline pressure if it were open to atmosphere?
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