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Village evacuated after Quebec train derailment

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The latest news is about the police having evidence that has caused them to open a criminal investigation, but they won’t say what that evidence is.  One recent statement was made in the context of being an example of criminal evidence, is as follows: “Canadian federal officials said Tuesday the train in Nantes should not have moved, even it had lost air pressure to the brakes, prompting suspicion of unauthorized actions.” Once again, this indicates a misunderstanding of railroad air brakes.  The statement is half true.  It is true in that the engine was not needed to be running and pumping air into the trainline to hold the brakes on as Burkhardt had falsely asserted.  As others have explained, that would actually release the brakes. However, if air pressure were lost from the brake cylinders, it would have indeed caused the train to move.  And there are several possible scenarios whereby the air could have been released from the cylinders, either by mistake, legitiment intent, or by vandalism.  So I don’t see the statement above leading to a certain conclusion that there had to be foul play. But here is another air brake question.  I fully understand bleeding cars that have been cut off with their brakes dynamited.  But if the air brakes were properly applied on that oil train (without hand brakes applied), what would happen if somebody walked the train and bled all the cars?  I assume it would totally release the brakes, just like bleeding a standing cut of cars to switch them.
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