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[quote user="BaltACD"]The human reality is iffy at best!  I can't trust you either.  [/quote] Well sure.  Nothing can be infallible.  But still, people do things to reduce the chance of things going wrong.  There is value in managing risk.  It may be all relative, but you can usually use good judgment to decide where the risk seems a little too high. I would not, as a blanket policy, conclude that something is safe enough as long as people do their job.  It depends on how much damage can occur if the one man fails to do his job.    I think it is too risky to rely on one man performing a complex hand brake procedure when a failure to get it right can destroy much of a town.  It is too risky to leave an oil train there even if the engineer could be relied on to set sufficient hand brakes every time.
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