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[quote user="BaltACD"] Question? The requirement is to secure the train! The specified formula is complied with to the letter. After a period of time, the train rolls away.   Who is responsible for the roll away?  Who will be charged for letting the train roll away?[/quote] That is a good question.  The forumla has to have an adequatde safety factor to make it almost perfectly reliable.  But anyting can fail if conditions are unsual enough.  If it ever fails, the formula must be changed based on the failure experience.  The ones who set the brakes to the formula would not be responsible. But the biggest problem with the formulaic approach is the handbrakes themselves.  Not only is there wide variation in their condition and effectiveness, but also, there is wide discretion in how tight to wind them.  A better handbrake is needed.
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