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Actually, I should not say that zugmann’s answer was incorrect.  The reason I asked the question was not to put anybody on the spot for not knowing the number.  I don’t know the number, so it seems to me that the rules would be impossible to follow.  So questioning that rule was my point in asking how many handbrakes would be required.  And zugmann is correct in that there are too many variables to answer the question, at least in terms of a calculation based on tonnage, consist, track condition, grade, etc.  When I said that zugmann’s answer (that there are too many variable to know the answer) can’t be the answer, I only meant it relative to the rule requiring a certain number of handbrakes. So I saw it as a catch-22.  I am sorry that it got personal. But just to close the loop, even with the correct answer that the number cannot be determined by just tonnage, consist, track condition, grade, etc., it still must be determined somehow.  The only way I can see to make the determination is with the push-pull test.  That would seem to be the practical way to find the number of hand brakes that would hold the train.  Yet the TSB says it is not reliable.  It would be very interesting to learn why they say that.  They just ruled out securring trains carrying dangerous material with handbrakes and the push-pull test because they say the push-pull test is not reliable.
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