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[quote user="tree68"] [quote user="Bucyrus"]However, if the rule called for a specific number, there would be solid evidence of the rule compliance if cars ran away after securement. [/quote] So what happens if the proper number of brakes are set, according to the rule, and the train runs away?[/quote] I don’t know the answer to that.   The presumption is that the number of handbrakes specified in the rule will do the job.  If it does not, I don’t see how the crew can be blamed if they set the number called for in the rule.  But the flaw in the prescription of a specific number of handbrakes is that there is no way to control how tightly somebody sets them, or how effective each handbrake will be according to its mechanical condition.  I don’t see a practical way to get around that flaw.  Apparently the only way the TSB sees to get around the flaw is to call for a number of handbrakes that greatly exceeds what is necessary.  But then that adds excess cost to the business.  And it is still no guarantee of securement even though there is the assumption of a huge safety factor.  I would say that this is what happens when bureaucracies roll their sleeves up and go to work on a problem.
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